Main category: English prefixes

English has many prefixes that are used to construct words, particularly in scientific and medical language. For a list of suffixes, see Appendix:English suffixes.

This page organizes prefixes alphabetically. To see this content sorted by category, see Appendix:English prefixes by semantic category. For a list of prefixes specifically for nationalities, ethnic groups, and languages see Appendix:English nationality prefixes. For SI prefixes: Appendix:SI units.

A	B	C	D	E	F	G	H	I	J	K	L	M	N	O	P	Q	R	S	T	U	V	W	X	Y	Z	References

M

Prefixes that start with M.
Prefix	All forms	Definition	Example	Category	Subcat	Alt-Sort
Mac-	Mac-	A patronymic used to form common Irish and Scottish names, similar to the English -son.		Proper nouns	Personal names
Macedo-	Macedo-	Macedonia.		Proper nouns	Extant countries	Macedonia
macro-¹	macr-¹, macro-¹	large.	e.g. macronucleus	Abstract	Size	Big
macro-²	macr-², macro-²	long.	e.g. macrobiotics	Abstract	Size	Long
macro-³	macr-³, macro-³	inclusive.	e.g. macroinstruction	Abstract	Inclusion
macro-⁴	macr-⁴, macro-⁴	(augmentative) intensely, extremely, or exceptional.		Abstract	Normality	Intensifying
macro-⁵	macr-⁵, macro-⁵	Great in scope or scale, to analyse at a high level, or existing in such a frame of reference.	e.g. macrosociology, macroanatomy, macrobenthos	Abstract	Scope
macro-⁶	macr-⁶, macro-⁶	Large in quantity.	e.g. macronutrient, macrodose	Abstract	Quantity
magico-	magico-	Magic, magical.		Social facts	Religion & mythology	Religion
magnesio-	magnesio-	Pertaining to magnesium.		Chemical substances	Elements	12
magnet-	fmagnet-, mag-, magneto-	Magnet, magnetism.		Physical properties	Other physical properties	Electromagnetic
magni-	magni-	Large, big.		Abstract	Size	Big
Magyaro-	Magyaro-	Hungary, Hungarian, Magyar.		Proper nouns	Extant countries	Hungary
mal-	mal-, male-²	Bad, faulty. not. abnormal. inadequate.	example(s) from^[1]: malnourish, maladjusted	Abstract	Goodness	Bad
malaco-	malaco-	Soft.		Colours, shapes, and textures	Textures	Soft
malario-	malario-	Malaria.		Body processes	Pathological
Malayo-	Malayo-, Malaysio-	Malaysia, Malaysian.	e.g. Malayophone	Proper nouns	Extant countries	Malaysia
male-¹	male-¹	Male, men.		Life stages	Genders	Male
malto-	malto-	(chemistry) Maltose.		Chemical substances	Biochemistry
mammillo-	mammill-^[2], mammillo-^[2]	(anatomy) Nipple^[2].	example(s) from^[2]: mammillaplasty, mammillitis	Body parts	Orifices
mammo-	mamm-, mammo-	Breasts.	example(s) from^[2]: mammogram	Body parts	Anatomical regions
mandibulo-	mandibulo-	Mandible.		Body parts	Bones
mangan-	mangan-, mangano-¹	Manganese.		Chemical substances	Elements	25
mangani-	mangani-	Manganic.		Chemical substances	Elements	25
mangano-²	mangano-²	Manganous.		Chemical substances	Elements	25
mani-	mani-, many-	Many, multiple.		Abstract	Quantity	3 - Much
Manju-	Manju-	Manchuria.		Proper nouns	Historical countries
manno-	manno-	Mannose.		Chemical substances	Biochemistry
manu-^[2]	manu-^[2]	(anatomy) Hand^[2].	example(s) from^[2]: manufacture	Body parts	Anatomical regions
mar-	mar-	(metallurgy) Relating to the production of martensite grains in steel.		Chemical substances	Materials
Marathi-	Marathi-	Marathi.	e.g. Marathiphone	Proper nouns	Languages
Marchigiano-	Marchigiano-	Marche.		Proper nouns	Historical countries
Marcho-	Marcho-	Altmark.		Proper nouns	Historical countries
masso-	masso-	Massage.		Human activities	Healing
mast-¹	mast-¹, masto-¹	Breasts, nipples, udders, teats.	example(s) from^[2]: mastectomy	Body parts	Orifices
mathematico-	mathematico-	Mathematics, mathematical.		Academic disciplines	Mathematical
matri-	materno-, matr-, matri-	Mother, motherhood.		Life stages	Life cycle	7 - Parent
maxi-	maxi-	Larger than usual.	example(s) from^[1]: maxi-skirt, maximum	Abstract	Size	Bigger
maxillo-	maxillo-	The jaw.		Body parts	Anatomical regions
Mc-	Mc-	A patronymic used to form common Irish and Scottish names, similar to the English -son. (informal) Used to create mock names.		Proper nouns	Personal names
meato-	meato-	(medicine) Meatus (opening).		Body parts	Orifices
mebi-	mebi-	2²⁰.		Abstract	Numbers	2²⁰
mechano-	mechano-	Mechanical.	e.g. mechanostability, mechanosensation, mechanofusion	Academic disciplines	Natural
meco-	meco-	Length or distance.		Abstract	Spatial
medico-	medico-	Medicine (“profession”); medical.		Academic disciplines	Health sciences
medio-	medio-, mesio-	Middle.		Abstract	Spatial	Centre
Medo-	Medo-	Pertaining to Media, Median or the Medes.		Proper nouns	Historical countries
mega-²	meg-², mega-²	Million, 10⁶. (computing) 2²⁰. (computing, marketing) 2¹⁰ * 10³. great, large.	e.g. megagram, megaton	Abstract	Numbers	10⁶
megalo-¹	meg-¹¹, mega-¹¹, megal-¹, megalo-¹	Large in size, enormous.	e.g. megalocardia, megalophobia, megalopolis	Abstract	Size	Big
megalo-²	meg-²¹, mega-²¹, megal-², megalo-²	Grand, great.	e.g. megalography, megalomania	Abstract	Goodness	Good
Megleno-	Megleno-	Almopia.		Proper nouns	Historical countries
meio-	meio-	Less, fewer, reduction.	e.g. meiobenthos	Abstract	Quantity	1 - Lesser than
mela-	mela-	Black; dark.		Colours, shapes, and textures	Shades	4 - Black
melano-	melan-^[2], melano-	Black.	example(s) from^[2]: melanin	Colours, shapes, and textures	Shades	4 - Black
melo-	melo-	Melody.		Academic disciplines	Linguistics
membrano-	membrano-	Membrane.		Body parts	Membranes
meningo-	mening-^[2], meningo-	The meninges.	example(s) from^[2]: meninges, meningitis	Body parts	Membranes
meno-¹	men-^[2]¹, meno-¹	Month, monthly.	e.g. menology	Celestial bodies and their rotations	Time periods	30.437
meno-²	men-^[2]², meno-²	Menses, menstruation.	example(s) from^[2]: menopause, menorrhagia	Body processes	Reproduction
mento-	mento-	The chin.		Body parts	Anatomical regions
mer-¹	mer-¹	Sea; marine.		Landforms and ecosystems	Oceanic
mer-²	mer-²	Applied to animals that are fully or partly sea-creatures.	e.g. mercow, mersnake, mereswine	Lifeforms	Animals
mer-³	mer-³	(fantasy) Mermaids, mermen.		Social facts	Religion & mythology	Mythology
mercapto-	mercapto-	An organosulfur compound that contains a carbon-bonded sulfhydryl or sulphydryl.		Chemical substances	Radicals
mercuri-	mercuri-	Relating to the planet Mercury.		Celestial bodies and their rotations	Solar system	1
mercurico-¹	mercurico-¹	Mercury.		Chemical substances	Elements	80
mercurico-²	mercurico-²	(chemistry) Mercuric.		Chemical substances	Elements	80
mero-^[2]	mer-³, mero-^[2]	Partly, partial. (anatomy) Part, component.	example(s) from^[2]: merocrine, meroblastic	Abstract	Composition	Part
meso-⁰¹	mes-⁰¹, meso-⁰¹	Middle or centre in location/position.	e.g. Mesoamerica, mesohepatectomy, mesoscaphe	Abstract	Spatial
meso-⁰²	mes-⁰², meso-⁰²	Between a macro- scale and micro- scale in scope or analysis.	e.g. mesoeconomics, mesoevolution, mesometeorology	Abstract	Scope
meso-⁰³	mes-⁰³, meso-⁰³	Medium in size.	e.g. mesobrowser, mesocavern, mesohabitat	Abstract	Size	Medium
meso-⁰⁴	mes-⁰⁴, meso-⁰⁴	Between.	e.g. mesochannel, mesoclitic, mesolayer	Abstract	Spatial
meso-⁰⁵	mes-⁰⁵, meso-⁰⁵	Intermediate between two properties or characteristics.	e.g. mesocratic, mesognathous, mesohydrophyte	Abstract	Intermediate
meso-⁰⁶	mes-⁰⁶, meso-⁰⁶	(anatomy) Referring to the mesentery.	e.g. mesoappendix, mesoduodenum, mesogastrium	Body parts	Membranes
meso-⁰⁷	mes-⁰⁷, meso-⁰⁷	(anatomy) Mesial in location, position, or direction: towards the midline of the body.	e.g. mesoanterior, mesomedial, meson	Abstract	Spatial
meso-⁰⁸	mes-⁰⁸, meso-⁰⁸	Normal, average, or typical.	e.g. mesochronic, mesocrystal, mesokurtosis	Abstract	Normality	Normal
meso-⁰⁹	mes-⁰⁹, meso-⁰⁹	(dentistry) The forward side of a tooth.	e.g. mesocone, mesoflexus, mesoloph	Abstract	Spatial
meso-¹⁰	mes-¹⁰, meso-¹⁰	The middle of a time period, or medium in duration.	e.g. mesocenozoic, mesocratic, Mesolithic	Abstract	Temporal
meso-¹¹	mes-¹¹, meso-¹¹	Quasi or partial.	e.g. mesocarnivore, mesobilirubin, mesoparasite	Abstract	Similarity
meso-¹²	mes-¹², meso-¹²	Moderate, medium in quantity.	e.g. mesoendemic, mesoeutrophic, mesohaline	Abstract	Quantity
meso-¹³	mes-¹³, meso-¹³	(chemistry) Designating an achiral member of a group of diastereoisomers that has at least one chiral member.	e.g. mesotartaric acid, mesolytic	Chemical substances	Forms
Messapo-	Messapo-	Messapii.		Proper nouns	Historical countries
meta-⁰¹	met-⁰¹, meta-⁰¹	(anatomy and zoology) Behind.		Abstract	Spatial
meta-⁰²	met-⁰², meta-⁰²	(botany and zoology) Later or subsequent.		Abstract	Temporal
meta-⁰³	met-⁰³, meta-⁰³	(obsolete, architecture and zoology) Situated between two segments.		Abstract	Spatial
meta-⁰⁴	met-⁰⁴, meta-⁰⁴	(chemistry) Having fewer molecules of water than the ortho- equivalent.		Abstract	Quantity
meta-⁰⁵	met-⁰⁵, meta-⁰⁵	(organic chemistry) In isomeric benzene derivatives, having the two substituents in alternate (1,3) positions; From 1833.		Abstract	Chemical structures
meta-⁰⁶	met-⁰⁶, meta-⁰⁶	(biochemistry) Relating to metabolism.		Body processes	Cellular processes
meta-⁰⁷	met-⁰⁷, meta-⁰⁷	Transcending, encompassing.		Abstract	Transcendence
meta-⁰⁸	met-⁰⁸, meta-⁰⁸	Pertaining to a level above or beyond; reflexive or recursive; about itself or about other things of the same type. For example, metadata is data that describes data, metalanguage is language that describes language, etc.		Abstract	Inclusion
meta-⁰⁹	met-⁰⁹, meta-⁰⁹	Having analogies with metaphysics.		Abstract	Conceptual
meta-¹⁰	met-¹⁰, meta-¹⁰	(geology) Modified by metamorphosis; analogies and derivatives of metamorphism.		Chemical substances	Materials
meta-¹¹	met-¹¹, meta-¹¹	(pathology) Consequent on.		Abstract	Influences	Consequent
metacarpo-	metacarp-, metacarpo-	Metacarpals.		Body parts	Bones
metallo-	metallo-	Metal, metallic.		Physical properties	Other physical properties
metatarso-	metatars-, metatarso-	Metatarsals.		Body parts	Bones
meteoro-	meteoro-	Related to weather.		Weather and natural disasters	Weather
metho-	meth-, metho-	(chemistry) Methyl.		Chemical substances	Functional groups
methoxy-	methoxy-	(chemistry) The univalent radical CH₃-O- derived from methanol.		Chemical substances	Derivatives
methyl-	methyl-	(chemistry) Used to form terms describing the attachment of a methyl group.		Chemical substances	Substituents
metro-¹	metr-¹, metro-¹	Metropolitan, city.	e.g. metropolis, metro-link	Social facts	Social institutions
metro-²	metr-², metro-²	(medicine) The uterus.	example(s) from^[2]: metrorrhagia	Body parts	Organs
metro-³	metr-³, metro-³	Measurement, the study of measurement.	e.g. metrology, metromania	Academic disciplines	Mathematical
metro-⁴	metr-⁴, metro-⁴	(poetry) Meter.		Academic disciplines	Linguistics
Mexico-	Mexico-	Mexico, Mexican.		Proper nouns	Extant countries	Mexico
micro-¹	micr-¹, micro-¹	Very small.	example(s) from^[1]: microbacillus, microscope	Abstract	Size	Small
micro-²	micr-², micro-²	10^-6.	e.g. microgram, micrometre	Abstract	Numbers	10^-6
micromicro-	micromicro-	(obsolete) Pico- (in the names of SI units).		Abstract	Numbers	10^-12
micto-	micto-	Mixed.		Abstract	Composition	Hybrid
mid-¹	mid-¹	Denoting the middle part.	e.g. mid-1930s, mid-30s, midlife	Abstract	Temporal
mid-²	mid-²	Occupying a middle position.	e.g. mid-shoulder	Abstract	Spatial
mid-³	mid-³	Intermediate.	e.g. mid-key	Abstract	Intermediate
mid-⁴	mid-⁴	Amid.		Abstract	Composition	Among
mid-⁵	mid-⁵	During, in the middle of doing something.	e.g. mid-jump	Abstract	Temporal
midi-	midi-	Medium sized.	example(s) from^[1]: midi-length, Midibus	Abstract	Size	Medium
migra-	migra-	Migration, wandering.		Abstract	Motion
milli-	milli-	10^-3. thousand.	example(s) from^[2]: milliliter	Abstract	Numbers	10^-3
millimicro-	millimicro-	(obsolete) Nano- (in the names of SI units).		Abstract	Numbers	10^-9
millimilli-	millimilli-	(obsolete) Micro- (in the names of SI units).		Abstract	Numbers	10^-6
mini-	mini-	Small.	example(s) from^[1]: minimarket, mini-room, minivan	Abstract	Size	Small
mis-¹	mis-¹	Bad or wrong, badly or wrongly.	e.g. misbehave, misaccumulation	Abstract	Goodness	Bad
mis-²	mis-²	To fail or failure.	e.g. miscarriage, misacknowledge	Abstract	Completion
mis-³	mis-³	Unintentionally, accidentally, mistakenly.	e.g. misdeleted, mishap, mischance	Abstract	Intention	Intention
mis-⁴	mis-⁴	False, falsely.	e.g. misaccusation	Abstract	Correctness	False
miso-	miso-	Hatred.		Body processes	Emotion
mito-¹	mit-¹, mito-¹	Thread, string.		Colours, shapes, and textures	Shapes	Filiform
mito-²	mit-², mito-²	(biology) Mitosis.		Body processes	Cellular processes
mito-³	mit-³, mito-³	(pharmacology) Used to form names of nucleotoxic agents used as antineoplastics.		Chemical substances	Pharmacological
mnemo-	mnemo-	Memory.		Body processes	Bodily needs and functions
Moeso-	Moeso-	Moesia.		Proper nouns	Historical countries
molyb-	molyb-	Molybdenum.	e.g. molybdenite, molybdian	Chemical substances	Elements	42
Mongolo-	Mongolo-	Mongolia, Mongols, Mongolian.		Proper nouns	Extant countries	Mongolia
mono-¹	mon-¹, mono-¹	One.	example(s) from^[1]: monogamy, monotone, monosyllabic, monomial, monobrow	Abstract	Numbers	1
mono-²	mon-², mono-²	Single, alone, limited.	e.g. monochrome, monopsony, monocity	Abstract	Similarity
Moravo-	Moravo-	Moravia; Moravian.		Proper nouns	Historical countries
morpho-	morph-, morpho-	Shape, form, morphology.	example(s) from^[2]: morphology	Abstract	Basis
mort-	mort-	Death.		Life stages	Life cycle	9 - Death
moto-¹	moto-¹	Motorcycle.		Technologies	Transportation
moto-²	moto-²	(biology) Motor; movement.		Body processes	Bodily needs and functions
muco-	muci-, muco-	Mucus.		Body parts	Bodily fluids
mucoso-	mucoso-	(medicine) Mucosal. referring to a mucosa (i.e., a mucous membrane).		Body parts	Membranes
multi-	multi-	Many.	example(s) from^[1]: multicultural, multi-storey, multitude	Abstract	Quantity	3 - Much
musculo-	muscul-^[2], musculo-	Muscle.	example(s) from^[2]: w:musculoskeletal system	Body parts	Muscles
musico-	musico-	Music.		Human activities	Types of media
muta-	muta-	Mutation, change.		Abstract	Similarity
myco-	myc-, myco-	Fungus, mushroom.	example(s) from^[2]: onychomycosis	Lifeforms	Fungi
mydro-	mydro-	Wide.		Abstract	Size	Wide
myel-	myel-, myelo-	Bone marrow, spinal cord.	example(s) from^[2]: w:myelin sheath, myeloblast	Body parts	Bones
mylo-	mylo-	(anatomy) Of or pertaining to the molars.	example(s) from^[2]: w:mylohyoid nerve	Body parts	Teeth
myo-	my-², myo-	Muscle.	example(s) from^[2]: myoblast	Body parts	Muscles
myria-	my-¹, myri-^[2], myria-, myrio-	Ten thousand. 10,000.	example(s) from^[2]: myriad	Abstract	Numbers	10⁴
myringo-	myring-, myringo-	Eardrum.	example(s) from^[2]: myringotomy	Body parts	Membranes
myrmeco-	myrmeco-	Ants.		Lifeforms	Animals
Myso-	Myso-	Mysia.		Proper nouns	Historical countries
mytho-	mytho-	Mythology.		Human activities	Types of media
myxo-	myx-^[2], myxo-	Mucus.	example(s) from^[2]: myxoma	Body parts	Bodily fluids

N

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Prefixes that start with N.
Prefix	All forms	Definition	Example	Category	Subcat	Alt-Sort
nab-	nab-	(pharmacology) Cannabinoid receptor agonist.		Chemical substances	Pharmacological
nal-	nal-	(pharmacology) Opiod receptor agonist.		Chemical substances	Pharmacological
nano-¹	nan-¹^[2], nano-¹	10^-9.	example(s) from^[2]: nanogram, nanosecond	Abstract	Numbers	10^-9
nano-²	nan-²^[2], nano-²	Nanotechnology.	e.g. nanobiology	Technologies	Types of technologies
nano-³	nan-³^[2], nano-³	Very small, nanoscale.	e.g. nanoparticle, nanoplankton	Abstract	Size	Small
naphtho-	naphtho-	(chemistry) Napthalene.		Chemical substances	Compounds
narco-¹	narc-¹^[2], narco-¹	Stupor, sleep.	example(s) from^[2]: narcolepsy	Body processes	Bodily needs and functions
narco-²	narc-²^[2], narco-²	Narcotics.	e.g. narcotherapy, narcoterrorism	Chemical substances	Pharmacological
naso-	nas-^[2], naso-	The nose.	example(s) from^[2]: nasal	Body parts	Organs
nat-	nat-, nati-, nato-^[2]	Birth.	example(s) from^[2]: neonatology	Life stages	Life cycle	1 - Birth
natro-	natr-, natro-	Sodium.		Chemical substances	Elements	11
Navarro-	Navarro-	Navarre, Navarrese.		Proper nouns	Historical countries
necro-	necr-, necro-	Death.	example(s) from^[2]: necrosis, w:necrotizing fasciitis	Life stages	Life cycle	9 - Death
nega-	nega-	Negative.		Abstract	Negation
negro-	negro-, nigro-	Black.		Colours, shapes, and textures	Shades	4 - Black
nemat-	nemat-, nemato-	Filiform structure, thread.		Colours, shapes, and textures	Shapes	Filiform
neo-	neo-	New, recent.	example(s) from^[1]: neolithic, neoether	Abstract	Temporal	3 - New
Nepalo-	Nepalo-	Nepal, Nepali.		Proper nouns	Extant countries	Nepal
nepho-	nepho-	Clouds.		Weather and natural disasters	Weather	Clouds
nephro-	nephr-, nephro-	The kidneys.	example(s) from^[2]: nephrology	Body parts	Organs
neptuni-	neptuni-	Relating to the planet Neptune.		Celestial bodies and their rotations	Solar system	8
nervo-	nerv-^[2], nervo-	Nerve.	example(s) from^[2]: nerve, w:nervous system	Body parts	Nerves
nether-	nether-	Low, lower, below, under, beneath. Inferior.		Abstract	Spatial	Downward
neuro-¹	neur-¹, neuri-¹^[3], neuro-¹	Nerves, nervous tissue, or the nervous system.	neuropathy, neurospinal, neurodynamics	Abstract	Body parts	Organ systems
neuro-²	neur-², neuri-²^[3], neuro-²	Neurodivergent or neurodiversity.	neuroqueer, neurospicy	Social facts	Political and social movements
neutro-	neutro-	Neutral, neither.		Abstract	Polarity	Neutrality
nevo-	nevo-	(medicine) Nevus skin lesion.		Body processes	Pathological
new-	new-	New, recent.		Abstract	Temporal	3 - New
nido-	nido-	Nest.		Colours, shapes, and textures	Shapes	Conical
nifur-	nifur-	(pharmacology) 5-nitrofuran.		Chemical substances	Pharmacological
Nigerio-	Nigerio-	Nigerian, Nigeria.		Proper nouns	Extant countries	Nigeria
nil-	nil-	Zero.		Abstract	Numbers	0
Nilo-	Nilo-, Niloto-	The Nile river.		Proper nouns	Regions	Bodies of water
niob-	niob-	Niobium, Columbium.	e.g. niobic, niobous	Chemical substances	Elements	41
Nippo-	Nippo-	Japanese, Japan.		Proper nouns	Extant countries	Japan
nitro-	nitr-, nitro-	Nitrogen.		Chemical substances	Elements	7
noci-	noci-	Pain, harm.	example(s) from^[2]: nociception	Body processes	Sensory
noct-	noct-	The night.		Celestial bodies and their rotations	Time periods	0.5
nodo-	nodo-	Lumpy, nodular^[4].		Colours, shapes, and textures	Shapes	Bumpy
nomen-	nomen-	Name.		Academic disciplines	Linguistics
nomino-	nomino-	(linguistics) The nominative case.		Academic disciplines	Linguistics
nomo-¹	nom-¹, nomo-¹	Law.		Social facts	Social institutions
nomo-²	nom-², nomo-²	Names.		Academic disciplines	Linguistics
non-¹	non-¹	Not.	e.g. nonaboriginal, nonabrasive, nonabstract	Abstract	Negation
non-²	non-²	Absence, lack of.	e.g. nonaccountability, nonacceleration, nonaction	Abstract	Completion
non-³	non-³	Avoiding.	e.g. nonabiding, nonacceptance, nonaccumulative	Abstract	Routing
non-⁴	non-⁴	Neutral.	e.g. nonaccent, nonacrocentric, nonaccent	Abstract	Polarity	Neutrality
nona-	non-⁵, nona-	Nine.		Abstract	Numbers	9
nonadeca-	nonadeca-	19.		Abstract	Numbers	19
noo-	noo-	The mind.		Body parts	Brain
nor-	nor-	(chemistry) Organic compound that is the parent of another.		Abstract	Parenthood
norm-	norm-, normo-²	(medicine) Normal^[2].	example(s) from^[2]: normocapnia	Abstract	Normality	Normal
Normanno-	Normanno-	Normandy, the Normans, or the Norman language.		Proper nouns	Historical countries
normo-¹	normo-¹	Rule, order, norms.		Social facts	Social institutions
Norvego-	Norvego-	Norwegian, Norway.		Proper nouns	Extant countries	Norway
noso-	noso-	Disease.		Body processes	Pathological
notho-	notho-	Used to indicate a hybrid taxonomic element.		Abstract	Composition	Hybrid
noto-¹	noto-¹	South, southern.		Abstract	Spatial	Cardinal
noto-²	noto-²	(paleontology) South America.		Proper nouns	Regions
nucleo-	nucleo-	Nuclear, a nucleus.		Particles	Particles	Atomic
nudi-	nudi-	Naked.		Abstract	Covering
nulli-	nulli-	Null.		Abstract	Quantity
numero-	numero-	Number, numbers.		Academic disciplines	Mathematical
nutri-	nutri-	Nutrition.		Academic disciplines	Health sciences
nyct-¹	nyct-¹, nycto-¹	The night.		Celestial bodies and their rotations	Time periods	0.5
nyct-²	nyct-², nycto-²	Darkness.		Colours, shapes, and textures	Shades	3 - Dark
nympho-	nympho-	Nymph. Adolescent girl.		Life stages	Life cycle	4 - Adolescent

O

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Prefixes that start with O.
Prefix	All forms	Definition	Example	Category	Subcat	Alt-Sort
ob-¹	ob-¹, os-¹	Inverse, reverse, particularly in shape.	e.g. obclavate, obconic, obcordate	Abstract	Negation
ob-²	ob-², os-²	Against.	e.g. object, oblatration	Abstract	Polarity	Opposition
ob-³	ob-³, os-³	To place before, go up to.	e.g. obtend, obverse, obreption	Abstract	Spatial	Towards
ob-⁵	ob-⁵, os-⁵	Before.	e.g. obvention, observant	Abstract	Temporal
ob-⁶	ob-⁶, os-⁶	Not quite, almost.	e.g. obdormition, obrotund	Abstract	Similarity
obstetro-	obstetro-	Obstetrics; pregnancy and birth.		Body processes	Reproduction
occipito-	occipit-, occipito-	The occipital bone.		Body parts	Bones
Occitano-	Occitano-	Occitania, Occitan.	e.g. Occitanophone	Proper nouns	Languages
ochl-	ochl-	Mob, mob-rule.	e.g. ochlagogue, ochlocracy, ochlocrat	Social facts	Political movements
ochlo-	ochlo-	Crowd of people, crowding, to form a crowd of people.		Human activities	Other human activities
octa-	oct-, octa-, octakis-, octo-	Eight.		Abstract	Numbers	8
octadeca-	octadeca-	Eighteen.		Abstract	Numbers	18
oculo-	ocul-^[2], oculo-	The eyes.	example(s) from^[2]: w:Oculist	Body parts	Organs
odo-	hodo-, odo-	Relating to roads.		Technologies	Transportation
odonto-	odont-^[2], odonto-	Teeth.	example(s) from^[2]: orthodontist	Body parts	Teeth
odyno-	odyn-^[2], odyno-	Pain.	example(s) from^[2]: stomatodynia	Body processes	Pathological
oeno-	eno-, oeno-, œno-	Wine.	e.g. oenochemistry, oenometer, oenocyte	Chemical substances	Foods
Of-	Of-	(UK) A regulatory body for a specified industry.		Social facts	Social institutions
off-	off-	Away from, off.	example(s) from^[1]: off-color, offish, offset	Abstract	Spatial	Away
oleo-¹	oleo-¹	Oil.		Chemical substances	Biochemistry
oleo-²	oleo-²	Oily.		Physical properties	Tasteable properties
olfacto-	olfacto-	Smell.		Body processes	Sensory
olig-	olig-, oligo-	Few.	example(s) from^[2]: oligotrophy	Abstract	Quantity	0 - Not much
olivo-	olivo-	(anatomy) Olivary body.		Body parts	Brain
Omano-	Omano-	Oman, Omani.		Proper nouns	Extant countries	Oman
ombro-	ombro-	Rain.		Weather and natural disasters	Weather	Precipitation
omento-	omento-	Omentum.		Body parts	Membranes
omni-	omni-	All, universal.	example(s) from^[1]: omnipotent, omnipresent, omnivore	Abstract	Composition	Whole
omo-	om-^[2], omo-	The shoulder.	example(s) from^[2]: omoplate	Body parts	Anatomical regions
omphalo-	omphal-, omphalo-	The navel.	example(s) from^[2]: omphalotomy	Body parts	Anatomical regions
on-	on-	On, toward, forward.	example(s) from^[1]: onset, onlook, ongoing, oncoming	Abstract	Spatial	Towards
onco-	onco-	Tumour, cancer.	example(s) from^[2]: oncology	Body processes	Pathological
oneiro-	oneir-, oneiro-	Dreaming.		Body processes	Bodily needs and functions
onomato-	onomato-	Name; word.		Academic disciplines	Linguistics
onto-	onto-	Existence, being.		Abstract	Transcendence
onych-	onych-, onycho-	Nails, claws.	example(s) from^[2]: onychophagy	Body parts	Integument
oo-	oo-, oö-	Egg.	example(s) from^[2]: oogenesis	Body parts	Gametes
oophor-	oophor-, oophoro-^[2]	Ovary. The ovaries.	example(s) from^[2]: oophorectomy	Body parts	Organs
ophio-	ophid-, ophio-	Snakes.		Lifeforms	Animals
ophryo-	ophry-, ophryo-	The eyebrow.		Body parts	Anatomical regions
opistho-	opistho-	Back, behind, rear.	example(s) from^[2]: opisthotonus	Abstract	Spatial	Back
opsono-	opsono-	Opsonin.		Chemical substances	Biochemistry
opthalmo-	ophthalmo-, opthalm-^[2]	Of or relating to eyes.	example(s) from^[2]: ophthalmology	Body parts	Organs
optic-	optic-, optico-^[2]	Vision.	example(s) from^[2]: opticochemical	Body processes	Sensory
opto-	opto-	Optical.		Body processes	Sensory
or-¹	or-¹	(non-productive) Out, outwards, laid out.	e.g. ordeal, orlay	Abstract	Spatial	Outward
or-²	or-²	(non-productive) Without, does not have.	e.g. orped	Abstract	Possession
or-³	or-³	(non-productive) From the outset; original.	e.g. ort, orgulous	Abstract	Temporal
orbito-	orbito-	(anatomy) Orbit.		Body parts	Cavities
orchi-	orch-, orchi-, orchid-^[2], orchido-, orchio-^[2], orcho-^[2]	Testicles.	example(s) from^[2]: orchiectomy, orchidectomy	Body parts	Organs
organo-¹	organo-¹	(biology) Organs.		Body parts	Organs
organo-²	organo-²	Organic. (chemistry) Organic chemistry.		Academic disciplines	Natural
ornitho-	ornith-, ornitho-	Birds.		Lifeforms	Animals
oro-¹	oro-¹	The mouth.	example(s) from^[2]: oral	Body parts	Orifices
oro-²	oro-²	Mountains.	e.g. orogeny	Landforms and ecosystems	Landforms
Oromo-	Oromo-	Oromo.		Proper nouns	Historical countries
ortho-⁰¹	orth-⁰¹, ortho-⁰¹	Right angle, perpendicular.	e.g. orthogon, orthocentric, orthoclastic	Abstract	Angles
ortho-⁰²	orth-⁰², ortho-⁰²	Proper, righteous, pure.	e.g. orthorexia, orthotaxon, orthology, orthoquartzite	Abstract	Goodness	Good
ortho-⁰³	orth-⁰³, ortho-⁰³	To correct or fix.	e.g. orthophotography, orthoptics, orthodontics	Abstract	Correctness	Fixing
ortho-⁰⁴	orth-⁰⁴, ortho-⁰⁴	Same, from the same.	e.g. orthocousin, cross-cousin, orthogamy	Abstract	Similarity
ortho-⁰⁵	orth-⁰⁵, ortho-⁰⁵	Normal, ordinary.	e.g. orthocclusion, orthodromic, orthogravitropism	Abstract	Normality	Normal
ortho-⁰⁶	orth-⁰⁶, ortho-⁰⁶	Straight in form.	e.g. orthoconic, orthodentin, orthognathous	Colours, shapes, and textures	Shapes	Linear
ortho-⁰⁷	orth-⁰⁷, ortho-⁰⁷	(crystallography) Orthohrombic crystal structure.	e.g. orthochrysotile, orthopyroxene, orthohexagonal	Colours, shapes, and textures	Shapes	Boxy
ortho-⁰⁸	orth-⁰⁸, ortho-⁰⁸	(organic chemistry) In isomeric benzene derivatives, having the two substituents in adjacent (1,2) positions (compare meta- and para-).	e.g. orthophenylene, orthosubstitution, orthocleavage	Abstract	Spatial
ortho-⁰⁹	orth-⁰⁹, ortho-⁰⁹	(chemistry) Having an extra proportion of water.	e.g. orthophosphate, orthosilicate, orthoferrite	Chemical substances	Substituents
ortho-¹⁰	orth-¹⁰, ortho-¹⁰	Independent, separate.	e.g. orthogonal, orthopair, orthogonal	Abstract	Influences
ortho-¹¹	orth-¹¹, ortho-¹¹	Original, primary.	e.g. orthonasal	Abstract	Temporal
ortho-¹²	orth-¹², ortho-¹²	Parallel lines or columns.	e.g. orthostyle, ortholinear, orthographic	Colours, shapes, and textures	Shapes	Branching
ortho-¹³	orth-¹³, ortho-¹³	(physics) Of any molecule of the form X₂ in which the two nuclei have parallel spin.	e.g. orthopositronium, orthohelium, orthoquarkonium	Physical properties	Other physical properties
ortho-¹⁴	orth-¹⁴, ortho-¹⁴	(medicine) Orthopaedics.	e.g. orthogeriatrics, orthosurgeon, orthoroentgenography	Academic disciplines	Health sciences
ortho-¹⁵	orth-¹⁵, ortho-¹⁵	Vertical or upright in movement.	e.g. orthotropic, orthostasis, orthograde	Abstract	Spatial
ortho-¹⁶	orth-¹⁶, ortho-¹⁶	(geology) Igneous.	e.g. orthogneiss, paragneiss, orthocumulate	Chemical substances	Materials
oscheo-	oscheo-	The scrotum.		Body parts	Anatomical regions
Osco-	Osco-	Oscan.		Proper nouns	Historical countries
osmio-	osmio-	(chemistry) Osmium.		Chemical substances	Elements	76
osmo-	osmo-	Osmosis.		Body processes	Cellular processes
osphresio-	osphresio-	Olfaction, to smell.		Body processes	Sensory
ossiculo-	ossiculo-	Ossicule.		Body parts	Bones
osteo-	osse-^[2], osseo-, ossi-, ost-^[2], oste-^[2], osteo-	Bone, bones.	example(s) from^[2]: w:peripheral ossifying fibroma, osseous	Body parts	Bones
ostreo-	ostreo-	Forms terms related to oysters.		Lifeforms	Animals
other-	other-	Different, other, alternative.		Abstract	Similarity	Different
oto-	ot-, oto-	Ear.	example(s) from^[2]: otology	Body parts	Organs
Oto-	Oto-	Otomi.		Proper nouns	Historical countries
out-¹	out-¹	External to, on the outside of.	e.g. outback, outhouse	Abstract	Spatial	Outside
out-²	out-²	Toward the outside of, away from.	e.g. outcast, outlead, outflee	Abstract	Spatial	Outward
out-⁵	out-⁵	Beyond. (synonyms: trans-, para-, preter-).	e.g. outgrew	Abstract	Transcendence
out-⁶	out-⁶	Completely.	e.g. outfit, outwork	Abstract	Completion
ovario-	ovari-^[2], ovario-	Ovaries.	example(s) from^[2]: ovariectomy	Body parts	Organs
over-¹	over-¹	Above, higher.	e.g. overbar, overlook	Abstract	Spatial	Above
over-²	over-²	Superior.	e.g. overlord	Abstract	Ranking
over-³	over-³	Excessive, excessively.	e.g. overkind, overloud, overstate	Abstract	Quantity	Too much
over-⁴	over-⁴	Surrounding or covering.	e.g. overcoat, overpaint	Abstract	Covering
over-⁵	over-⁵	Augmentative: exceptional; extremely or intensely.	example(s) from^[1]: overreact, overact, overbearing	Abstract	Normality	Augmentative
ovo-	ov-, ovi-, ovo-, ovulo-	Egg. ovum.	example(s) from^[2]: ovogenesis	Body parts	Gametes
oxa-	oxa-	(chemistry) Used to name compounds in which a carbon atom (typically a methylene group) has been replaced by one of oxygen.		Chemical substances	Substituents
oxalo-	oxal-, oxalo-	(chemistry) Derived from, or related to oxalic acid. Containing the radical -CO-COOH derived from oxalic acid by removal of a hydroxyl.		Chemical substances	Derivatives
oxaza-	oxaza-	(chemistry) Used to name compounds in which two carbon atoms have been replaced by one of oxygen and one of nitrogen.		Chemical substances	Substituents
oxo-¹	ox-¹, oxi-, oxo-¹, oxy-²	Oxygen.	e.g. oxophilic, oxofluoride, oxygenated	Chemical substances	Elements	8
oxo-²	ox-², oxo-²	(chemistry) Having a methylene group replaced by a carbonyl group.	example(s) from^[2]:	Chemical substances	Substituents
oxy-¹	oxy-¹	Sharp, keen, pointed, acute.	e.g. oxygon, oxymoron	Colours, shapes, and textures	Textures	Sharp
oxysm-	oxysm-, oxysmo-	Sudden.	e.g. paroxysm	Abstract	Temporal	Temporary

P

A	B	C	D	E	F	G	H	I	K	L	M	N	O	P	Q	R	S	T	U	V	W	X	Y	Z	References

Prefixes that start with P.
Prefix	All forms	Definition	Example	Category	Subcat	Alt-Sort
pachy-	pachy-	Thick.	example(s) from^[2]: pachyderma, pachyderm	Abstract	Size	Thick
Pako-	Pak-, Pako-	Relating to Pakistani, Pakistan.		Proper nouns	Extant countries	Pakistan
palato-	palat-, palato-	Palate, roof of mouth.		Body parts	Anatomical regions
paleo-	palae-, palaeo-, pale-, paleo-, palæ-, palæo-	Very old, prehistoric, ancient. very early, primitive, archaic.	example(s) from^[1]: paleolithic	Abstract	Temporal	2 - Old
palin-	pali-, palin-	Again, repeated, recur.		Abstract	Temporal	Repeat
pallado-	palladio-, pallado-	(chemistry) Palladium.		Chemical substances	Elements	46
palliato-	palliato-	To relieve, soothe. Palliative.		Human activities	Healing
palpebro-	palpebr-^[2], palpebro-	Eyelid.	example(s) from^[2]: palpebra	Body parts	Integument
palpiot-	palpit-, palpito-	Flutter, throb.		Abstract	Motion
palpo-	palp-, palpo-	To gently touch.		Abstract	Influences	Touch
palyno-	palyno-	Pollen; palynology.		Body parts	Gametes
pan-⁰¹	pan-⁰¹, pano-⁰¹	All, referring to all, of all.	panenteroviral, Panhellenic, panneural, panphilia	Abstract	Scope
pan-⁰²	pan-⁰², pano-⁰²	Every member of a countable set.	pancarditis, panophthalmitis, panplegia	Abstract	Completion
pan-⁰³	pan-⁰³, pano-⁰³	Most, nearly all, effectively all in quantity.	panallergenic, panbacterial, panhypopituitarism	Abstract	Quantity
pan-⁰⁴	pan-⁰⁴, pano-⁰⁴	Encompassing, including all, or involving all.	pancaspase, pangender, panlingual	Abstract	Composition
pan-⁰⁵	pan-⁰⁵, pano-⁰⁵	Entire, whole, the entirety of the suffixed object or category.	pancolonoscopy, pangastritis, pangenomic	Abstract	Spatial
pan-⁰⁶	pan-⁰⁶, pano-⁰⁶	Universal, everything, all that can be imagined.	pangeometry, panphobia, theopanism	Abstract	Influence
pan-⁰⁷	pan-⁰⁷, pano-⁰⁷	Unification of a social group, the political movement to unify said group.	Pan-Africanism, pan-Indianism, pan-nationalism	Social facts	Political and social movements
pan-⁰⁸	pan-⁰⁸, pano-⁰⁸	Spanning the entirety of a set which may not be countable, its members may not be clearly distinguished from each other.	pancontinental, pan-Covid, pancultural	Abstract	Size
pan-⁰⁹	pan-⁰⁹, pano-⁰⁹	Throughout an area indicated by the suffix.	panarctic, pancolitis, panfandom	Abstract	Spatial
pan-¹⁰	pan-¹⁰, pano-¹⁰	Representing or covering a given social group.	Pan-Asian, pan-Palestinian, Pan-Anglican	Abstract	Influence
pan-¹¹	pan-¹¹, pano-¹¹	Ubiquitous, widespread. The suffix indicates what is widespread rather than the area in which it is widespread.	panallergen, pannecrosis	Abstract	Normality
pan-¹²	pan-¹², pano-¹²	(LGBTQ) Pansexual or pansexuality.	pancurious, panphobia	Social facts	Political and social movements
pancreato-	pancreat-, pancreatico-, pancreato-	Pancreas.		Body parts	Organs
panto-	pant-, panta-, panto-	Indicating the whole, entirety.		Abstract	Composition	Whole
papa-	papa-	Of or pertaining to the pope or the papacy.		Social facts	Social institutions
papillo-	papill-^[2], papillo-	Papilla, nipple.	example(s) from^[2]: papillitis	Body parts	Orifices
papulo-	papul-^[2], papulo-	Papule.	example(s) from^[2]: papulation	Body processes	Pathological
Papuo-	Papuo-	Papua, Papuan.		Proper nouns	Languages
papyro-	papyro-	Papyrus. Also used for paperwork.		Technologies	Communication technologies
para-⁰¹	par-⁰¹, para-⁰¹	Beside, alongside.	e.g. parasite, parallel, paracapsular	Abstract	Spatial	Beside
para-⁰²	par-⁰², para-⁰²	Parallel.	e.g. paraconformity, paraxial	Abstract	Angles	Parallel
para-⁰³	par-⁰³, para-⁰³	Between.	e.g. paracellular, paraconule, paradiploid	Abstract	Spatial	Between
para-⁰⁴	par-⁰⁴, para-⁰⁴	Around, surrounding.	e.g. paracortex, paradiapophysis	Abstract	Spatial	Surrounding
para-⁰⁵	par-⁰⁵, para-⁰⁵	Covering.	e.g. paracolpitis	Abstract	Covering
para-⁰⁶	par-⁰⁶, para-⁰⁶	Adjacent, next to.	e.g. paracentral, paracaval	Abstract	Routing
para-⁰⁷	par-⁰⁷, para-⁰⁷	Near.	e.g. paranal, parepididymis, parethmoid	Abstract	Spatial	Near
para-⁰⁸	par-⁰⁸, para-⁰⁸	On the opposite side of.	e.g. paracavernous	Abstract	Spatial	Opposite
para-⁰⁹	par-⁰⁹, para-⁰⁹	Above, over.	e.g. paraductal, paracoronoid, paracondylar	Abstract	Spatial	Above
para-¹⁰	par-¹⁰, para-¹⁰	Across, through, throughout.	e.g. paracotylar, paraesophageal, paracloacal, paracostal	Abstract	Spatial	Across
para-¹¹	par-¹¹, para-¹¹	Beyond.	e.g. paradox, paranormal, paraclival	Abstract	Transcendence
para-¹²	par-¹², para-¹²	Abnormal.	e.g. paralgesia	Abstract	Normality	Abnormal
para-¹³	par-¹³, para-¹³	Incorrect, false.	e.g. paradiorthosis	Abstract	Correctness	False
para-¹⁴	par-¹⁴, para-¹⁴	Resembling.	e.g. paramilitary, paramylum	Abstract	Similarity
para-¹⁵	par-¹⁵, para-¹⁵	Unrecognized, unauthorized, or unsanctioned.	e.g. parastate, parabaptism	Abstract	Goodness	Bad
para-¹⁶	par-¹⁶, para-¹⁶	Avoiding or avoidant.	e.g. parenteral, paraconsistent	Abstract	Routing
para-¹⁷	par-¹⁷, para-¹⁷	(chemistry) In isomeric benzene derivatives, having the two substituents in opposite (1,4) positions.		Abstract	Spatial	Opposite
para-¹⁸	par-¹⁸, para-¹⁸	Affecting or concerning the lower body.	e.g. paranesthesia, paraballism	Body parts	Anatomical regions
parasito-	parasito-	Parasite.		Body processes	Pathological
pari-¹	pari-¹	Equal.	e.g. parity	Abstract	Similarity
pari-²	pari-²	(anatomy) Even in quantity.	e.g. paridigitate, paripinnate	Abstract	Quantity
parieto-	parieto-	Pareital bone.		Body parts	Bones
parthen-	parthen-, partheno-	Parthenogenesis, without fertilization.		Body processes	Reproduction
parvo-	parvo-	Small.	example(s) from^[2]: w:Parvovirus	Abstract	Size	Small
patello-	patello-	Patella.		Body parts	Bones
pater-	pater-	Father, patriarch.		Life stages	Life cycle	7 - Parent
patho-	path-, patho-	Disease, pathology.	example(s) from^[2]: w:Pathology	Body processes	Pathological
patro-	patr-, patri-	Father, fatherhood.		Life stages	Life cycle	7 - Parent
pauci-	pauci-	(biology) Having or involving few.	e.g. paucisymptomatic, paucispiral	Abstract	Quantity	0 - Not much
pebi-	pebi-	2⁵⁰.		Abstract	Numbers	2⁵⁰
pectoro-	pector-, pectoro-	Chest.	example(s) from^[2]: pectoralgia, pectoriloquy, pectorophony	Body parts	Anatomical regions
pedi-	ped-^[1], pedi-	Foot, feet.	e.g. pedal, pedestrian	Body parts	Anatomical regions
pedo-¹	paedo-¹', pedo-¹', pædo-¹'	Feet.		Body parts	Anatomical regions
pedo-³	paedo-³', pedo-³', pædo-³'	Children.		Life stages	Life cycle	3 - Child
peg-	peg-	(biochemistry) Used to form names of PEGylated molecules.		Chemical substances	Forms
peloro-	peloro-	(taxonomy) A morpheme term pertaining to monsters, in the popular sense of "something huge".		Abstract	Size	Big
pelvi-	pelv-^[2], pelvi-, pelvo-^[2]	Pelvis.	e.g. pelviureteric, pelviperineal, pelviperitonitis	Body parts	Anatomical regions
pend-	pend-	To hang down.		Abstract	Spatial	Down
pene-	pen-^[1], pene-	Almost.	e.g. peninsula, penultimate, penumbra	Abstract	Similarity
peno-	peno-	(anatomy) Penis.		Body parts	Organs
penta-	pent-, penta-, pentakis-, penti-	Five.		Abstract	Numbers	5
pentadeca-	pentadeca-	Fifteen.		Abstract	Numbers	15
pentaprismo-	pentaprismo-	(chemistry) Compounds having ten atoms bound into a pentagonal prism.		Colours, shapes, and textures	Shapes	Boxy
peo-^[2]	peo-^[2]	(medicine) Penis^[2].	example(s) from^[2]: w:Peotomy	Body parts	Organs
per-¹	per-¹	(non-productive) In verbs: denoting the sense "through".	e.g. perforate	Abstract	Spatial
per-²	per-²	(non-productive) In verbs: denoting the sense "thoroughly".	e.g. perfect	Abstract	Completion
per-³	per-³	(non-productive) In verbs: denoting the sense "to destruction".	e.g. pervert	Abstract	Composition	Un-joining
per-⁴	per-⁴	(non-productive) In adjectives and adverbs: denoting the sense "extremely".	e.g. perfervid	Abstract	Normality	Intensifying
per-⁵	per-⁵	(chemistry) Forming nouns and adjectives denoting the maximum proportion of one element in a compound.	e.g. peroxide	Abstract	Quantity
per-⁶	per-⁶	(chemistry) Added to the name of an element in a polyatomic ion to denote the number of atoms of that element (usually four).		Abstract	Chemical structures
per-⁷	per-⁷	(non-productive) Denoting the sense "by" or par from French.	e.g. perchance, perhaps	Abstract	Influences
perfluoro-	perfluoro-	(chemistry) Used to describe any compound or group in which every hydrogen atom has been replaced by fluorine.		Chemical substances	Substituents
peri-¹	peri-¹	around or surrounding.	e.g. perimeter, meter	Abstract	Spatial
peri-²	peri-²	near.	e.g. perihelion, helion	Abstract	Spatial
peri-³	peri-³	during.	e.g. peri-apocalyptic, apocalyptic, perinatal, natal	Abstract	Temporal
perineo-	perineo-, peritone-	Perineum.		Body parts	Anatomical regions
perma-	perma-	Permanent.		Abstract	Temporal	Permanent
pero-	pero-	Congenital absence of a body part.		Body processes	Pathological
perone-	perone-	Fibula.		Body parts	Bones
peroxy-	peroxy-	(chemistry) Used to name compounds containing the divalent peroxy -O-O- radical.		Chemical substances	Radicals
Perso-	Perso-	Persia, Persian, Iran, Iranian.	e.g. Persophone	Proper nouns	Extant countries	Iran
peta-	peta-	(United States of America) quadrillion, 10¹⁵. (Great Britain) septillion, 10²⁴.		Abstract	Numbers	10¹⁵
petro-	petro-	Rocks. Petrol, fossil fuels.		Chemical substances	Materials
phaco-	phaco-, phako-	Lens.	example(s) from^[2]: phacolysis, phacometer, phacoscotoma	Colours, shapes, and textures	Shapes	Yonic
phago-	phagist-^[2], phago-	Eating, feeding, consuming.	e.g. phagocytosis, phagophobia, phagokinesis	Body processes	Bodily needs and functions
phallo-	phall-^[2], phallo-	Penis.	example(s) from^[2]: w:Aphallia	Body parts	Organs
phanero-	phanero-	Visible.		Colours, shapes, and textures	Shades	0 - Colourless
pharmaco-	pharma-, pharmac-^[2], pharmaco-	Pertaining to pharmaceuticals or pharmacology.	e.g. pharmacokinetic, pharmacoenhancer	Academic disciplines	Health sciences
pharyngo-	pharyng-^[2], pharyngo-	Pharynx.	example(s) from^[2]: pharyngitis, pharyngoscopy	Body parts	Tubes and ducts
pheno-¹	phaeno-, phen-¹, pheno-¹, phæno-	Displaying, showing.		Abstract	Covering
pheno-²	phen-², pheno-¹	Benzene.		Chemical substances	Functional groups
pheo-	phaeo-, pheo-	Grey or dark in colour.		Colours, shapes, and textures	Shades	3 - Dark
phil-	phil-, philo-	Liking, loving.	e.g. philathletic, phillumeny, philhippic	Body processes	Emotion
phimo-	phimo-	Muzzle.		Body parts	Anatomical regions
phlebo-	phleb-^[2], phlebo-	Veins.	example(s) from^[2]: phlebography, phlebotomy	Body parts	Tubes and ducts
phob-	phob-, phobo-	Fear.		Body processes	Emotion
Phoenico-	Phoenico-	Phoenicia.		Proper nouns	Historical countries
phono-	phon-, phono-	Sound.	example(s) from^[2]: phonograph, symphony	Body processes	Sensory
phos-^[2]	phos-^[2]	(medicine) Light and its chemical properties.	example(s) from^[2]: phosphene	Physical properties	Other physical properties	Electromagnetic
phospha-	phospha-	(chemistry) Indicating that phosphorus substitutes for another atom in the molecule name it prefixes.		Chemical substances	Substituents
phospho-	phosph-, phospho-, phosphoro-	Phosphorous.		Chemical substances	Elements	15
photo-	phot-, photo-	Light, electromagnetic radiation, radiant energy. photograph.	example(s) from^[1]: photoelectric, photography, photosynthesis	Physical properties	Other physical properties	Electromagnetic
phragmo-	phragmo-	Divided due to obstruction or barrier.		Abstract	Composition	Un-joining
phreno-¹	phren-¹, phreni-¹, phrenic-¹^[2], phrenico-¹, phreno-¹	Mind.	e.g. phrenology, aphrenia, phrenopathy	Body parts	Brain
phreno-²	phren-², phreni-², phrenic-²^[2], phrenico-², phreno-²	Diaphragm.	e.g. phrenocostal, phrenoplegia, phrenospasm	Body parts	Muscles
Phrygio-	Phrygio-	Relating to Phrygia, the Phrygians or the Phrygian language.		Proper nouns	Historical countries
phyco-	phyco-	Seaweeds, algae.		Lifeforms	Plants
phyllo-	phyllo-	Leaves.	example(s) from^[2]: w:phyllodes tumour, phyllotaxis	Body parts	Organs
phylo-	phylo-	Group, grouping.		Abstract	Composition
physi-	phys-, physi-	Nature; physical.		Academic disciplines	Natural
physico-	physico-	Physical, physics.		Academic disciplines	Natural
physio-	physio-	Nature, natural, physical. Physiology, physiotherapy.		Academic disciplines	Natural
physo-	physo-	Air, gas, particularly in an organism (e.g. air sac).	e.g. physograde, physogastry, physometra	Body parts	Bodily fluids
phyto-	phyto-	Plants.		Lifeforms	Plants
pico-	pico-	10^-12.		Abstract	Numbers	10^-12
picro-	picro-	Bitter.		Physical properties	Tasteable properties
pict-	pict-	Paint, draw, visualize, show.	e.g. pictograph, pictorial	Human activities	Language
Picto-	Picto-	A combining form relating to Pictland (prehistoric northern and eastern Scotland) or Pictish people (Picts).		Proper nouns	Historical countries
piezo-	piezo-	Pressure.		Abstract	Mass
pilo-	pilo-	Hair.		Body parts	Integument
pimelo-	pimelo-	Fatty.		Physical properties	Tasteable properties
pinealo-	pineal-, pinealo-	Pineal gland.		Body parts	Brain
pinni-¹	pinni-¹	Wings.		Body parts	Anatomical regions
pinni-²	pinni-²	Feathers.		Body parts	Integument
piri-	piri-	Pear-shaped^[2].	example(s) from^[2]: w:Piriformis muscle	Colours, shapes, and textures	Shapes	Round
Pisano-	Pisano-	Pisa.		Proper nouns	Historical countries
pisci-	pisci-	Fish.		Lifeforms	Animals
pitheco-	pitheco-	Ape.		Lifeforms	Animals
pituitaro-	pituitaro-	Pituitary gland.		Body parts	Brain
placento-	placento-	Placenta.		Body parts	Organs
placo-	placo-	Plate-shaped. Typically used for scales of animal skins.	e.g. Placodermi, Placodontia	Colours, shapes, and textures	Shapes	Bumpy
plagio-	plagio-	Oblique angle.		Abstract	Angles	Oblique
planeto-	planeto-	Used to form astronomical terms related to planets.		Celestial bodies and their rotations	General
plani-	plani-, plano-	Level, flat.		Abstract	Angles	Straight
planto-	planto-	Sole of the foot.		Body parts	Anatomical regions
plas-	plas-, plaso-	Formation, development, structure.		Abstract	Basis
plasmo-	plasmo-	Plasma.		Physical properties	States of matter	4 - Plasma
plasto-¹	plasto-¹	Plastid.		Body parts	Cellular
plasto-²	plasto-²	Plastic.		Chemical substances	Materials
platini-	platini-, platino-	(chemistry) Platinic, Platinum.		Chemical substances	Elements	78
platinoso-	platinoso-	(chemistry) Platinous.		Chemical substances	Elements	78
platy-	platy-	Level, flat.		Abstract	Angles	Straight
pleo-	pleio-, pleo-	More.	example(s) from^[1]: pleonasm, pleroma	Abstract	Quantity	2 - More than
plesio-	plesio-	Close, near.		Abstract	Spatial	Near
pleuro-¹	pleur-¹^[2], pleuro-¹	(anatomy) The pleurae.	e.g. pleurogenic, pleuropericarditis	Body parts	Membranes
pleuro-²	pleur-²^[2], pleuro-²	To the side, lateral.	e.g. pleurocentrum, pleurocoel	Abstract	Spatial	Side
plumbo-	plumb-, plumbo-	Lead.		Chemical substances	Elements	82
pluri-	pluri-	Several.		Abstract	Quantity	3 - Much
plusquam-	plusquam-	(chiefly forming nonce words) more than; beyond (in degree).		Abstract	Quantity	2 - More than
pluto-¹	pluto-¹	Wealth or money.		Social facts	Social institutions	Economic
pluto-²	pluto-²	Plutonium.		Chemical substances	Elements	94
pluvio-	pluvio-	Rain; rainfall.		Weather and natural disasters	Weather	Precipitation
pneumato-	pne-²^[2], pneum-², pneumat-, pneumato-, pneumo-², pneumon-², pneumono-²	Air; gas.	e.g. pneumatic, pneumotactile, pneumatometer, pneumothorax	Physical properties	States of matter	3 - Gas
pneumo-¹^[2]	pne-¹^[2], pneum-¹, pneumo-¹, pneumon-¹, pneumono-¹	Lungs.	example(s) from^[2]: apnea, pneumatology, pneumonocyte, pneumonia	Body parts	Organs
podo-	pod-, podo-	Feet.	example(s) from^[1]: podiatrist	Body parts	Anatomical regions
pogono-	pogono-	Beard.		Body parts	Integument
poikilo-¹	poecilo-¹, poikilo-¹, pœcilo-¹	Variable.	e.g. poikilocapnic, poikilochlorophyllous, poikilothermic	Abstract	Similarity
poikilo-²	poecilo-², poikilo-², pœcilo-²	Variegated.	e.g. poikiloblast, poikiloderma, poecilosclerid	Colours, shapes, and textures	Hues
Poké-	Poké-	Pertaining to the Pokémon media franchise.		Proper nouns	Popular culture
pol-	pol-	Polonium.	e.g. polane, polonide	Chemical substances	Elements	84
polio-¹	poli-¹, polio-¹	Grey.	example(s) from^[2]: poliomyelitis	Colours, shapes, and textures	Shades	2 - Grey
polio-²	poli-², polio-²	Grey matter of the nervous system.	example(s) from^[2]: poliomyelitis	Body parts	Organ systems
politico-	politico-	Political, politics, political science.		Academic disciplines	Societal
Polono-	Polono-	Polish. of or pertaining to Poland.	e.g. Polonophone	Proper nouns	Extant countries	Poland
poly-¹	poly-¹	many	polydactyl, polyglot, polyvalent	Abstract	Quantity	3 - Much
poly-²	poly-²	polymer	polyacetal, polyethene, polyether	Chemical substances	Forms
poly-³	poly-³	polyamory	polycule, polyphobia, polyfamily	Abstract	Social facts	Social and political movements
polydeoxy-	polydeoxy-	Various polymers of deoxynucleotides and their derivatives.		Chemical substances	Derivatives
polydeoxyribo-	polydeoxyribo-	Used to form various polymers of deoxyribonucleotides and their derivatives.		Chemical substances	Derivatives
polymorpho-	polymorpho-	(medicine) Polymorphous.		Abstract	Similarity
polypo-	polypo-	Polyp.		Body processes	Pathological
polyribo-	polyribo-	Forming the names of polyribonucleotides and derived words.		Chemical substances	Derivatives
porn-	porn-, porno-	Pornography.		Human activities	Types of media
poro-	por-^[2], poro-	Pores.	e.g. porocalyx, porotaxy, poroscopy	Body parts	Cavities
porphyr-^[2]	porphyr-^[2]	Purple^[2].	example(s) from^[2]: porphyroblast	Colours, shapes, and textures	Hues	9 - Purple
porta-	porta-	Portable, movable.		Abstract	Motion
porto-	porto-	Portal vein.		Body parts	Tubes and ducts
poseido-	poseido-	Neptune.		Celestial bodies and their rotations	Solar system	8
posito-	posito-	Placement, arrangement, positioning.		Abstract	Basis
post-¹	post-¹	after, later.	example(s) from^[1]: postfix, postpone, postscript	Abstract	Temporal
post-²	post-²	(anatomy) behind.		Abstract	Spatial
postero-	posterio-, postero-	The posterior; opposite of anterior.		Abstract	Spatial
potamo-	potam-, potamo-	River.		Landforms and ecosystems	Landforms
potassio-	potassio-	Potassium.		Chemical substances	Elements	19
praseo-	praseo-	Green.		Colours, shapes, and textures	Hues	4 - Green
pre-¹	prae-¹, pre-¹, præ-¹	Before; physically in front of; (anatomy) anterior.	example(s) from^[1]: prefix	Abstract	Spatial
pre-²	prae-², pre-², præ-²	Before; earlier in time; beforehand.	example(s) from^[1]: predict, prepare, preview, preschool, prewrite	Abstract	Temporal
pred-	pred-	(pharmacology) Prednisolone.		Chemical substances	Pharmacological
prepro-	prepo-, prepro-	Denoting a precursor.		Abstract	Temporal
presby-	presby-, presbyo-	Elder, old.	example(s) from^[2]: presbyopia, presbycusis^[5]	Abstract	Temporal	2 - Old
preter-	praeter-, preter-, præter-	Exceeding, beyond expectations.	e.g. preterlegal, preternature, preternormal	Abstract	Transcendence
prim-¹	prim-¹, prime-¹	First, earliest.	example(s) from^[2]: primary	Abstract	Temporal
prim-²	prim-², prime-²	Foremost, chief, principal, prime, eminent.	e.g. primly	Abstract	Ranking
pristanoyl-	pristanoyl-	(chemistry) Pristanic acid.		Chemical substances	Acids
pro-¹	pro-¹	agreeing with; supporting; favouring.	e.g. pro-choice, prodifferentiation, probiotic	Abstract	Polarity	Support
pro-²	pro-²	substituting for.		Abstract	Influences	Transferal
pro-³	pro-³	Forward movement.	e.g. procede, propel, progress	Abstract	Spatial
pro-⁴	pro-⁴	earlier; prior.		Abstract	Temporal
pro-⁵	pro-⁵	rudimentary.		Abstract	Complexity
pro-⁶	pro-⁶	in front of.		Abstract	Spatial
procto-	proct-, procto-	Rectum.	example(s) from^[2]: proctology	Body parts	Intestines	8
prop-	prop-	(chemistry) Three carbon atoms.		Chemical substances	Forms
proso-	pros-^[1], proso-	Towards, forward.	e.g. prosthesis, prostrate, prose	Abstract	Spatial	Forward
prosopo-	prosop-, prosopo-	The face.	example(s) from^[2]: prosopagnosia	Body parts	Anatomical regions
proteo-	proteo-	Protein.		Chemical substances	Biochemistry
protero-	protero-	First, earliest, early.		Abstract	Temporal	0 - First
proto-¹	prot-¹, proto-¹	Primitive, early, undeveloped.	e.g. protophysics, protometal, protoword	Abstract	Completion
proto-²	prot-², proto-²	Original, older.	e.g. protograph, protolacteal, prototype, protoplasm	Abstract	Temporal
proto-³	prot-³, proto-³	First in order.	e.g. protogynous, protandrous	Abstract	Ordinal	1
proto-⁴	prot-⁴, proto-⁴	Primary.	e.g. protoderm, protocneme	Abstract	Ranking
proto-⁵	prot-⁵, proto-⁵	(linguistics) Most recent common ancestor (often hypothetical) of.	e.g. Proto-Indo-European, Proto-Germanic	Abstract	Parenthood
proto-⁶	prot-⁶, proto-⁶	(chemistry) A minimal proportion of a particular substance when in a combination.	e.g. protoxide, protosulfide, protiodide	Abstract	Quantity
proto-⁷	prot-⁷, proto-⁷	(chemistry) Relating to protons and/or positive charge.	e.g. protophilic, protolysis	Particles	Particles	Composite
proto-⁸	prot-⁸, proto-⁸	(anatomy) Anterior.	e.g. prototroch, protoconid, protoconule	Abstract	Spatial
Provenço-	Provenço-	Provence, Provençal.		Proper nouns	Languages
proximo-	proxi-, proxim-, proximo-	Nearby, close to.		Abstract	Spatial	Near
prurito-	prurito-	Itching.		Body processes	Pathological
Prusso-	Prusso-	Prussia, Prussian.		Proper nouns	Historical countries
pseph-	pseph-, psepho-	Pebble, stone. Voting, election, ballot box.		Social facts	Social institutions
pseudo-¹	pseud-¹, pseudo-¹	Not true, but appears like it is true.	e.g. pseudoallergy, pseudoallelism, pseudobenevolent	Abstract	Correctness	False
pseudo-²	pseud-², pseudo-²	Substitute, simulation.	e.g. pseudoangle, pseudarthrosis; example(s) from^[1]: pseudonym	Abstract	Composition	Substitution
psilo-	psilo-	Bare, smooth.		Colours, shapes, and textures	Textures	Smooth
psor-^[2]	psor-^[2]	(medicine) Itching^[2].	example(s) from^[2]: psoriasis	Body processes	Pathological
psycho-	psych-, psycho-	Mind, brain, psychology.	e.g. psychostimulant, psychoacoustics, psychosocial	Academic disciplines	Health sciences
psychoto-	psychoto-	Psychosis.		Body processes	Pathological
psychro-¹	psychro-¹	The perception of cold.	e.g. psychrophobia, psychrotolerance, psychrotherapy	Body processes	Sensory	Temperature
psychro-²	psychro-²	Cold.	e.g. psychroplanet, psychroxerophytic, psychrometer	Physical properties	Climactic conditions	Heat
pterido-	pterid-, pterido-	Ferns.		Lifeforms	Plants
ptero-¹	pter-¹, ptero-¹, ptery-¹^[2]	Wing.	e.g. Pterosaur, pterophorid, pterochorous	Body parts	Anatomical regions
ptero-²	pter-², ptero-², ptery-²^[2]	Feather.	e.g. pterography, pterophyte	Body parts	Integument
ptero-³	pter-³, ptero-³, ptery-³^[2]	Wing-like.	example(s) from^[2]: w:lateral pterygoid plate³	Colours, shapes, and textures	Shapes	Branching
pterygo-¹	pteryg-¹, pterygo-¹	Relating to the wing, or fin.	e.g. pterygoblast, pterygobranchiate	Body parts	Anatomical regions
pterygo-²	pteryg-², pterygo-²	Wing-shaped.		Colours, shapes, and textures	Shapes	Branching
pterygo-³	pteryg-³, pterygo-³	Pterygoid. Of, pertaining to or lying in the region of the inferior part of the sphenoid bone of the vertebrate skull.	e.g. pterygomalar	Body parts	Bones
ptilo-¹	ptilo-¹	Feather, down.		Body parts	Integument
ptilo-²	ptilo-²	Feather-shaped.	e.g. ptilolite	Colours, shapes, and textures	Shapes	Branching
ptyalo-	ptyalo-	Saliva.		Body parts	Bodily fluids
pubo-	pubo-	Pubis.		Body parts	Bones
pulmo-^[2]	pulmo-^[2], pulmon-, pulmono-	Lungs.	example(s) from^[2]: pulmonary	Body parts	Organs
puls-	puls-, pulsato-, pulso-	To beat, to pulse.		Abstract	Motion
punct-	punct-	Puncturing, pricking points.	e.g. punctiform, pyropuncture, acupuncture	Body processes	Pathological
Punico-	Punico-	Carthage.		Proper nouns	Historical countries
pur-¹	pur-¹	Forwards, movement.	e.g. pursue, purport	Abstract	Spatial	Forward
pur-²	pur-²	Completion or completeness.	e.g. purchase, purblind	Abstract	Completion
purpureo-	purpureo-	Purple.		Colours, shapes, and textures	Hues	9 - Purple
pycno-	pycno-, pykno-	Dense, compact.	example(s) from^[2]: pyknosis	Abstract	Mass
pyelo-	pyel-^[2], pyelo-	(anatomy) Renal pelvis.	example(s) from^[2]: pyelonephritis	Body parts	Tubes and ducts
pygo-	pygo-	Buttocks.		Body parts	Anatomical regions
pyloro-	pylor-^[2], pyloro-	Pylorus. Gate^[2].	example(s) from^[2]: w:pyloric sphincter	Body parts	Orifices
pyo-	py-, pyo-	Pus.	example(s) from^[2]: pyometra	Body processes	Pathological
pyreto-	pyr-², pyreto-, pyrexo-, pyro-²	Fever.	e.g. pyrotherapy, pyrogen	Body processes	Pathological
pyro-¹	pyr-¹, pyro-¹	Fire, heat.	example(s) from^[1]: pyrokinetic, pyrotechnic	Physical properties	Climactic conditions	Heat
pyro-³	pyr-³, pyro-³	(chemistry) Orthoacid.	e.g. pyrocarbonate	Chemical substances	Acids
pyrrh-	pyrrh-	Red.		Colours, shapes, and textures	Hues	1 - Red
pyrrolidino-	pyrrolidino-	(chemistry) Containing a pyrrolidine ring.		Chemical substances	Radicals

Q

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Prefixes that start with Q.
Prefix	All forms	Definition	Example	Category	Subcat	Alt-Sort
qu-	qu-	Quantum computing.		Technologies	Types of technologies
quad-	quad-	Involving four elements.		Abstract	Numbers	4
quadri-	quadr-, quadri-, quadro-, quadru-	Four.	example(s) from^[1]: quadrilateral, quadrinomial	Abstract	Numbers	4
qual-	qual-	Quality.		Abstract	Basis
quant-	quant-	Quantity.		Abstract	Basis
quarter-¹	quarter-¹	Fourth part.		Abstract	Ordinal	4
quarter-²	quarter-²	1/4.		Abstract	Numbers	0.25
quarter-³	quarter-³	Three-month term.		Celestial bodies and their rotations	Time periods	91.311
quasi-	quasi-	Like, similar.	example(s) from^[1]: quasi-religious	Abstract	Similarity	Similar
quecto-	quecto-	10^-30.		Abstract	Numbers	10^-30
quer-	quer-, ques-	Seek, ask.		Abstract	Intention	Intention
quetta-	quecca-, quetta-	10³⁰.		Abstract	Numbers	10³⁰
quin-	quin-, quinqu-, quinque-	Five.		Abstract	Numbers	5
Qurano-	Qurano-	The Quran.		Proper nouns	Religions/philosophies

R

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Prefixes that start with R.
Prefix	All forms	Definition	Example	Category	Subcat	Alt-Sort
race-	rac-, race-	(chemistry) Denoting a racemic mix or racemate of enantiomers; equal quantities of.		Abstract	Proportions
rachi-	rachi-, rhachi-^[2], rhachio-^[2]	The spine.	example(s) from^[2]: rachial, rachialgia, rachidian, rachiopathy	Body parts	Bones
racio-	racio-	Study of race/racism.	e.g. raciolinguistics, raciology	Academic disciplines	Societal
radiculo-	radic-^[2], radiculo-	The root of a nerve.	example(s) from^[2]: radiculopathy	Body parts	Nerves
radio-¹	radi-¹, radio-¹	Radiation, radioactive.	e.g. radiotherapy, radioactinium, radiolucent	Physical properties	Other physical properties
radio-²	radi-², radio-²	Radio waves, radio broadcasting.	e.g. radiotelemetry, radioacoustics, radiotelegraph	Technologies	Communication technologies
radio-³	radi-³, radio-³	(anatomy) Radius (bone).	e.g. radiobicipital, radioneuritis	Body parts	Bones
radio-⁴	radi-⁴, radio-⁴	(mathematics) Radius.	e.g. radiosymmetrical	Abstract	Basis
rage-	rage-	(slang) Anger, angering.		Body processes	Emotion
re-¹	re-¹	Again.	e.g. renew, recommit, reheat	Abstract	Temporal
re-²	re-²	Completion; updated, anew.	example(s) from^[6]: reletter, relead, rebronze	Abstract	Completion
re-³	re-³	Back, backward.	e.g. reject, reply, resist	Abstract	Spatial
recti-	recti-	Straight.		Abstract	Angles	Straight
recto-	rect-, recto-	The rectum.	e.g. rectoabdominal, rectosacral, rectophobia	Body parts	Intestines	8
recto-²	recto-²	In the direction of the rectum.	e.g. rectoabdominal	Abstract	Spatial
regio-	regio-	Region, regional geography.		Abstract	Basis
religio-	religio-	Religion.		Social facts	Social institutions
reno-	ren-^[2], reni-, reno-	The kidneys.		Body parts	Organs
rept-	rept-	Crawl, creep (as a form of locomotion).		Body processes	Bodily needs and functions
respiro-	respiro-	Breathing.		Body processes	Bodily needs and functions
resuscito-	resuscito-	Resuscitation.		Human activities	Healing
reticulo-	reticul-^[2], reticulo-	Reticulated, network, mesh.	example(s) from^[2]: reticulocyte	Abstract	Routing
retino-	retino-	The retina.		Body parts	Eyes
retro-	retro-	Backwards, behind.	example(s) from^[1]: retrograde	Abstract	Spatial	Backward
rhabdo-	rhabd-, rhabdo-	Rod, rod-like.	example(s) from^[2]: rhabdomyolysis	Colours, shapes, and textures	Shapes	Cylindrical
Rhaeto-	Rhaeto-, Rhæto-	Rhaetia; Rhaetian.		Proper nouns	Historical countries
rhamno-	rhamno-	Rhamnose.		Chemical substances	Biochemistry
rheo-	rheo-	Current, flow.		Abstract	Motion
rheumato-	rheumato-	Watery flow.		Body processes	Pathological
rhino-	rhin-, rhino-	The nose.	example(s) from^[2]: rhinoceros, rhinoplasty	Body parts	Organs
rhizo-	rhiz-, rhizo-	Roots.		Body parts	Organs
rhod-²	rhod-²	Rhodium.	e.g. rhodate, rhodocene	Chemical substances	Elements	45
rhodo-	rhod-¹^[2], rhodo-	Rosy, reddish pink.	example(s) from^[2]: rhodophyte	Colours, shapes, and textures	Hues	0 - Pink
rhombi-	rhombi-	(geometry) Having four-sided faces.		Colours, shapes, and textures	Shapes	Boxy
rhyncho-	rhyncho-	Beak, snout.		Body parts	Anatomical regions
ribo-	ribo-	Set of 3 CHOH molecules, ribose.		Chemical substances	Forms
rifa-	rifa-	(pharmacology) Used to form names of rifamycin derivatives used as antibiotics.		Chemical substances	Pharmacological
robo-	robo-	Robot.		Technologies	Types of technologies
Romano-¹	Romano-¹	Romani.		Proper nouns	Languages
Romano-²	Romano-²	Romania, Romanian.		Proper nouns	Extant countries	Romania
Romano-³	Romano-³	Rome, Roman.		Proper nouns	Historical countries
ronna-	ronna-	10²⁷.		Abstract	Numbers	10²⁷
ronto-	ronto-	10⁻²⁷.		Abstract	Numbers	10^-27
roseo-	roseo-	Rosy, reddish pink.		Colours, shapes, and textures	Hues	0 - Pink
rostro-	rostro-	Rostrum; the oral or nasal region of an organism.		Abstract	Spatial
roto-	roto-	Rotation, turn.		Abstract	Motion
Ruando-	Ruando-, Rwando-	Rwanda, Rwandan.	e.g. Rwandophone	Proper nouns	Extant countries	Rwanda
rubid-	rubid-	Rubidium.	e.g. rubidic, rubidide	Chemical substances	Elements	37
rubr-^[2]	rubr-^[2], rubro-	(medicine) The red nucleus of the brain^[2].	example(s) from^[2]: rubrospinal	Body parts	Brain
rufo-	rufo-	Reddish.		Colours, shapes, and textures	Hues	1 - Red
rupt-	rupt-	To break.		Abstract	Composition	Un-joining
Russo-	Russo-	Russian.	e.g. Russophone	Proper nouns	Extant countries	Russia
ruthenio-	ruthenio-, rutheno-	Ruthenium.		Chemical substances	Elements	44
Rutheno-	Rutheno-	Ruthenia.		Proper nouns	Historical countries

S

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Prefixes that start with S.
Prefix	All forms	Definition	Example	Category	Subcat	Alt-Sort
saccharo-	saccharo-	Sugar.		Chemical substances	Biochemistry
sacculo-	sacculo-	(anatomy) Sacculus.	e.g. sacculocochlear, sacculoutricular, sacculolagenar	Body parts	Ears
sacro-	sacr-, sacro-	Sacrum.		Body parts	Bones
sado-	sado-	Sadism, desire to inflict pain.		Human activities	Other human activities	Sexuality
Saharo-	Saharo-	The Sahara.		Proper nouns	Regions
Sahelo-	Sahelo-	The Sahel.		Proper nouns	Regions
saint-	saint-	Saint.		Social facts	Religion & mythology	Religion
sal-	sal-	(pharmacology) Salicylic acid.		Chemical substances	Pharmacological
salazo-	salazo-	(pharmacology) Phenylazosalicylic acid.		Chemical substances	Pharmacological
salpingo-	salping-, salpingo-	Fallopian tubes.	example(s) from^[2]: salpingectomy, w:salpingopharyngeus muscle	Body parts	Organs
same-	same-	Same, similar.		Abstract	Similarity	Similar
sangui-	sangui-, sanguine-^[2]	Blood.	e.g. sanguivorous, sanguify	Body parts	Bodily fluids
sapo-	sapo-, sapon-	Soap.		Chemical substances	Materials
sapro-	sapr-, sapro-	Putrid, rotten matter.	example(s) from^[2]: saprogenic	Body processes	Pathological
sarco-	sarc-, sarco-	Flesh.	example(s) from^[2]: sarcoma, sarcoidosis	Body parts	Connective tissues
Sardo-	Sardo-	Sardinia.		Proper nouns	Historical countries
Sarmato-	Sarmato-	Sarmatians.		Proper nouns	Historical countries
sauro-	sauro-	Lizard.		Lifeforms	Animals
Saxo-	Saxo-	Saxons, Saxony.		Proper nouns	Historical countries
scandio-	scandio-, scando-	Scandium.	e.g. scandiobabingtonite, scandocene	Chemical substances	Elements	21
Scando-	Scando-	Pertaining to Scandinavia.		Proper nouns	Regions
scapho-	scapho-	Shaped like a boat.		Colours, shapes, and textures	Shapes	Yonic
scapulo-	scapul-^[2], scapula-, scapulo-	(anatomy) Scapula.	example(s) from^[2]: scapulothoracic, w:facioscapulohumeral muscular dystrophy	Body parts	Bones
scato-	scato-	Excrement, feces.	e.g. scatophagy	Body processes	Bodily needs and functions
sch-	sch-, sh-	Used to intensify a word, especially for comedic effect.		Abstract	Intensity
schisto-²	schist-^[2]², schisto-²	(geology) Schist, shale.	e.g. schistous, schistaceous	Chemical substances	Materials
schizo-¹	schist-^[2]¹, schisto-¹, schiz-¹ , schizo-¹	Split, cleft, splittable.	e.g.schizodactyly, schizogony, schizoid, schizophasia	Abstract	Composition	Un-joining
schizo-²	schiz-² , schizo-²	Schizophrenia.	e.g. schizoaffective, schizosexual	Body processes	Pathological
schm-	schm-, shm-	Used to intensify a word, especially for comedic effect.		Abstract	Intensity
scientifico-	scientifico-	Science; scientific.		Academic disciplines	Natural
scint-	scint-, scinti-	Scintillating.		Physical properties	Other physical properties	Electromagnetic
sclero-¹	scirrho-, scler-^[2]¹, sclero-¹	Hard.	e.g. scleroatrophy, sclerous, sclerosponge	Colours, shapes, and textures	Textures	Hard
sclero-²	scler-^[2]², sclero-²	(anatomy) Sclera.	e.g. scleroplasty, scleromalacia	Body parts	Eyes
scolio-	scoli-, scolio-	Crooked, bent.	example(s) from^[2]: scoliosis	Abstract	Angles	Bent
scopol-	scopol-	(pharmacology) Indicating elements obtained from Scopolia japonica.		Chemical substances	Pharmacological
scoto-	scot-^[3], scoto-, skoto-	Darkness.	example(s) from^[2]: w:scotopic vision	Colours, shapes, and textures	Shades	3 - Dark
Scoto-	Scoto-, Scotto-	Scottish, Scotland, or the historical Scotti people.		Proper nouns	Extant countries	Scotland
scroto-	scroto-	Relating to the scrotum.		Body parts	Anatomical regions
Scytho-	Scytho-	Pertaining to Scythia, Scythian or the Scythians.		Proper nouns	Historical countries
se-¹	se-¹	(non-productive) Apart, away from.	e.g. secede, seclude, segregate	Abstract	Spatial	Away
se-²	se-²	(non-productive) Without.	e.g. secure	Abstract	Possession
sebo-	sebace-, sebo-	Sebum.		Body parts	Bodily fluids
sec-	sec-	(chemistry) secondary-form of a functional group, a branched functional group.		Abstract	Ordinal	2
seismo-	seismo-	Earthquakes.		Weather and natural disasters	Seismic
selen-	selen-, seleno-¹	The Moon.		Celestial bodies and their rotations	Solar system	3
selenio-	selenio-, seleno-²	Selenium.		Chemical substances	Elements	34
self-	self-	Self, ones own.	example(s) from^[1]: self-sufficient, self-explanatory	Abstract	Self
semanto-	semanto-	Semantic.		Academic disciplines	Linguistics
semi-¹	semi-¹	half.		Abstract	Numbers	0.5
semi-²	semi-²	partial, incomplete.		Abstract	Completion
semi-³	semi-³	somewhat, rather, quasi-.		Abstract	Similarity
semin-	semin-	Semen, seed.		Body parts	Gametes
semio-	semio-	Sign, symbol, signifier.		Academic disciplines	Linguistics
Semito-	Semito-	Semites.		Proper nouns	Languages
semper-	semper-	Always, unvarying.	e.g. semperannual, sempergreen, semperjuvenescent	Abstract	Temporal	Permanent
sen-	sen-	Old.		Abstract	Temporal	2 - Old
sept-	sept-, septa-, septem-, septi-, septua-	Seven.		Abstract	Numbers	7
septo-	septo-	Partition.		Abstract	Composition	Un-joining
sequ-¹	sequ-¹	A sequence.		Abstract	Routing
Serbo-	Serbo-	Serbian.		Proper nouns	Extant countries	Serbia
sero-	sero-	Serum; presence in blood.		Body parts	Bodily fluids
sesqui-	sesqui-	3/2.		Abstract	Numbers	1.5
sexa-	sex-, sexa-	Six.		Abstract	Numbers	6
sexuo-	sexuo-	(rare) Of or concerning sexuality.	e.g. sexuoerotic, sexuo-economic	Academic disciplines	Societal
she-	she-	A female, usually an animal.		Life stages	Genders	Female
sialo-	sial-, sialo-	Saliva.	example(s) from^[2]: sialagogue	Body parts	Bodily fluids
Siamo-	Siamo-	Pertaining to Thailand or to Thai(s).		Proper nouns	Extant countries	Thailand
Sibero-	Sibero-	Siberia, Siberian.		Proper nouns	Historical countries
Siculo-	Siculo-	Sicily, Sicilian.		Proper nouns	Historical countries
sidero-¹	sidero-¹	Of stars and constellations.		Celestial bodies and their rotations	General
sidero-²	sidero-²	(astronomy) Sidereal.		Abstract	Spatial
sidero-³	sidero-³	Iron.		Chemical substances	Elements	26
sigmoido-	sigmoid-, sigmoido-	Sigmoid colon.	example(s) from^[2]: w:sigmoid colon	Body parts	Intestines	7
silici-	silici-	Silex; silica.		Chemical substances	Materials
silico-	silico-	Silicon.		Chemical substances	Elements	14
simio-	simio-	Related to simians.		Lifeforms	Animals
simul-	simul-	Resembling, likeness.		Abstract	Similarity	Similar
sinistro-	sinistr-^[2], sinistro-	Leftwards, to the left.	example(s) from^[2]: sinistrocardia	Abstract	Spatial	Left
Sino-	Sino-	China.	e.g. Sinophone	Proper nouns	Extant countries	China
sinuso-	sino-, sinus-^[2], sinuso-	Sinus.	example(s) from^[2]: sinusitis	Body parts	Cavities
siphono-	siphono-	Siphon.		Colours, shapes, and textures	Shapes	Curly
sito-	sito-	Food, especially grain.	e.g. sitosterol, sitosterone; example(s) from^[2]: sitophobia	Chemical substances	Foods
skeleto-	skeleto-	Skeleton.		Body parts	Bones
skia-^[7]	hemero-^[7]	skia-^[7]	Lack of colour^[7].		Colours, shapes, and textures	Shades	0 - Colourless
Slavo-	Slavo-	Slavic.	e.g. Slavophone	Proper nouns	Languages
Slovako-	Slovako-	Pertaining to Slovakia or Slovakian.	e.g. Slovakophone	Proper nouns	Extant countries	Slovakia
Sloveno-	Sloveno-	Pertaining to Slovenia.		Proper nouns	Extant countries	Slovenia
socio-	soci-, socio-	Social, society, sociological.	example(s) from^[1]: sociopath	Academic disciplines	Societal
sodio-	sodio-	(chemistry) Compound of sodium.		Chemical substances	Elements	11
soleno-	soleno-	Having a tube, a duct or a pipe; Having a cavity by which something can pass, like venom.		Colours, shapes, and textures	Shapes	Cylindrical
Somali-	Somali-	Somalia, Somalian.		Proper nouns	Extant countries	Somalia
somato-	somat-^[2], somatico-^[2], somato-	The body. Bodily^[2].	example(s) from^[2]: somatic	Body parts	Anatomical regions
somno-	somn-, somn-^[2], somni-, somno-	Sleep.		Body processes	Bodily needs and functions
sono-¹	sono-¹	Sonic, sound. Used particularly for technologies that use sound.	e.g. sonomicrometry, sonobuoy, sonochemistry	Physical properties	Other physical properties
sono-²	sono-²	The perception of sound.	e.g. sonophobia, sonosensitizer, sonotaxis	Body processes	Sensory
sous-¹	sous-¹	Under, underneath.	e.g. sousveillance, souterrain, sous-vide	Abstract	Spatial	Beneath
sous-²	sous-²	Subordinate.	e.g. sous-chef, sous-lieutenant	Abstract	Ranking
Sovieto-	Sovieto-	Soviet Union.		Proper nouns	Historical countries
spano-	spano-	Scarce.		Abstract	Quantity	0 - Not much
spasmo-	spasmo-	Spasm.	example(s) from^[2]: w:Spasmodic dysphonia	Body processes	Pathological
spatio-	spatio-	Spatial. space.		Abstract	Basis
spec-	spec-	Look, see.		Body processes	Sensory
spectro-	spectro-	Optical spectra.	e.g. spectrometer, spectromicroscopy, spectrospatial	Physical properties	Other physical properties
speleo-	speleo-	Cave.		Landforms and ecosystems	Landforms
spermato-	sperma-^[2], spermato-, spermo-	Sperm, semen.	example(s) from^[2]: spermatogenesis	Body parts	Gametes
spheno-	sphen-, spheno-	Wedge-shaped.		Colours, shapes, and textures	Shapes	Yonic
sphero-	spher-, spherico-, sphero-	Spherical.		Colours, shapes, and textures	Shapes	Round
sphinctero-	sphinctero-	Sphincter.		Body parts	Muscles
sphygm-	sphygm-, sphygmo-	(medicine) Pulse, pulsation (of blood delivered by the beating heart).		Body processes	Bodily needs and functions
spino-	spino-	Spine, vertebra.		Body parts	Bones
spiro-¹	spiro-¹	Spiral, coiled.		Colours, shapes, and textures	Shapes	Curly
spiro-²	spiro-²	(medicine) Breathing.		Body processes	Bodily needs and functions
splanchno-	splanchn-^[2], splanchni-^[2], splanchno-	The viscera.	example(s) from^[2]: splanchnology	Body parts	Organs
spleno-	splen-^[2], spleno-	Spleen.	example(s) from^[2]: splenectomy	Body parts	Organs
spondylo-	spondyl-, spondylo-	The spine.	example(s) from^[2]: spondylitis	Body parts	Bones
spongo-	spongio-, spongo-	(zoology) Sponge.		Lifeforms	Animals
sporo-	spor-, spori-, sporo-	Spores.		Body parts	Gametes
squamo-	squamo-, squamos-^[2], squamoso-^[2]	Made of scales, scaly.	example(s) from^[2]: w:squamous cell	Colours, shapes, and textures	Textures	Scaly
stanno-	stann-, stanno-	Tin.		Chemical substances	Elements	50
stannoso-	stannoso-	(chemistry) Denoting relation to, or connection with, certain stannous compounds.		Chemical substances	Derivatives
staped-	staped-	Stapes in ear.		Body parts	Ears
staphylo-¹	staphylo-¹	Pertaining to a microorganism cluster with a grape-like arrangement.		Lifeforms	Bacteria
staphylo-²	staphylo-²	The uvula.		Body parts	Organs
stat-	stat-	State, control.		Abstract	Influences	Control
stato-	stato-	Balance, equilibrium, rest.		Abstract	Rates
stauro-	stauro-	Cross; cross-shaped.		Colours, shapes, and textures	Shapes	Cross
steato-	steato-	Fat.		Body parts	Connective tissues
stego-	stego-	Covered, hidden.		Abstract	Covering
stello-	stello-	Star. celestial body.		Celestial bodies and their rotations	General
steno-¹	sten-¹^[2], steno-¹	Restricted, few, narrow in range (antonym: eury-).	e.g. stenobiomic, stenophagy, stenotherm	Abstract	Similarity
step-	step-	Related via marriage of parent.	example(s) from^[1]: stepbrother, stepmother, stepfather, stepsister	Abstract	Parenthood
stereo-¹	stereo-¹	Three-dimensional.	e.g. stereophonic	Abstract	Basis
stereo-²	stereo-²	Relating to the binocular contribution to three-dimensional vision.	e.g. stereopsis, stereoblind	Body processes	Sensory
stereo-³	stereo-³	Solid, hard.	e.g. stereotype plate	Colours, shapes, and textures	Textures	Hard
stereo-⁴	stereo-⁴	Solid.		Physical properties	States of matter	1 - Solid
sterno-	stern-, sterno-	Sternum.		Body parts	Bones
stetho-	steth-, stetho-	The chest.	example(s) from^[2]: stethoscope	Body parts	Anatomical regions
stheno-^[2]	stheno-^[2]	Strength, force, power^[2].	e.g. sthenolagnia, sthenic	Abstract	Potency
stibo-	stib-, stibio-, stibo-	(chemistry) Antimony.		Chemical substances	Elements	51
sticho-	sticho-	Rows.		Abstract	Basis
stigmato-	stigmato-	Mark, point.		Abstract	Landmarks
stomato-	stom-^[2], stomat-^[2], stomato-	Mouth; opening.	example(s) from^[2]: stomatogastric, w:stomatognathic system	Body parts	Orifices
strati-	strati-	Layer.		Abstract	Layers
strato-¹	strato-¹	Strata.		Abstract	Layers	Layer
strato-²	strato-²	Stratus clouds.		Weather and natural disasters	Weather	Clouds
strepto-	strepto-	Twisted.		Colours, shapes, and textures	Shapes	Curly
striato-	striato-	(anatomy) Striatum.		Body parts	Brain
stronti-	stronti-	Strontium.	e.g. strontianite, strontiofluorite	Chemical substances	Elements	38
stygo-	stygo-	Dark and damp, like the Underworld.		Physical properties	Climactic conditions	Humidity
stylo-¹	stylo-¹	Style, stylus.		Technologies	Communication technologies
stylo-²	stylo-²	(medicine) Styloid process.		Body parts	Bones
sub-¹	sub-¹, sur-³	Under, beneath.	e.g. subterranean, submarine, subcutaneous	Abstract	Spatial	Beneath
sub-²	sub-², sur-³	Subsidiary, secondary.	e.g. subplot	Abstract	Ranking
sub-³	sub-³, sur-³	Almost, nearly.	e.g. subconical, subequatorial	Abstract	Similarity
succin-	succin-	Relating to or derived from succinic acid.		Chemical substances	Derivatives
succo-	succo-	Juice.	e.g. succose, succotash	Chemical substances	Foods
sucr-	sucr-, sucro-	Sugar.		Chemical substances	Biochemistry
Sudano-	Sudano-	Sudan.		Proper nouns	Extant countries	Sudan
sudo-	sudo-	Sweat.		Body parts	Bodily fluids
Sueco-	Sueco-, Swedo-	Pertaining to Sweden or Swedish.	e.g. Swedophone	Proper nouns	Extant countries	Sweden
sui-	sui-	Self, personal.		Abstract	Self
sulfa-	sulfa-, sulpha-	(pharmacology) Used to form names of sulfonamides used as antiinfectives.		Chemical substances	Pharmacological
sulfo-¹	sulf-¹, sulfo-¹, sulph-¹, sulpho-¹	Sulfur.		Chemical substances	Elements	16
sulfo-²	sulf-², sulfo-², sulph-¹, sulpho-¹	Sulfonic acid.		Chemical substances	Acids
sulfonio-	sulfonio-, sulphonio-	(chemistry) Sulfur onium.		Chemical substances	Compounds
sulphureo-	sulphureo-	(obsolete) Used as a combining form to indicate sulphureous and some other property.		Chemical substances	Forms
Sumero-	Sumero-	Sumerian.		Proper nouns	Historical countries
super-¹	super-¹	Located above.	e.g. superoccipital, superlabial, supergastric	Abstract	Spatial	Above
super-¹⁰	super-¹⁰	Regarding superheroes.		Social facts	Religion & mythology	Mythology
super-²	super-²	A more inclusive category.	e.g. supercategory, superfamily, superculture	Abstract	Inclusion
super-³	super-³	Beyond, over, or upon.	e.g. supernatural, superhuman, supersonic	Abstract	Transcendence
super-⁴	super-⁴	Greater than in quantity.	e.g. superwavelength, supersynchronous, superrotation	Abstract	Quantity	More than
super-⁵	super-⁵	Excessive; exceptionally large in quantity.	e.g. superphosphate, superhydration	Abstract	Quantity	Excessive
super-⁶	super-⁶	Superior in title or status.	example(s) from^[1]: supervisor, superintendent	Abstract	Ranking
super-⁷	super-⁷	Superior in power or potency.	e.g. supervolcano, supercow, superantigen	Abstract	Potency
super-⁸	super-⁸	Augmentative: intensely, extremely, or exceptional.	e.g. superblizzard, superbright, supersharp	Abstract	Normality	Augmentative
super-⁹	super-⁹	(physics) Described using supersymmetry.	e.g. superparticle, superpartner, superWIMP	Physical properties	Other physical properties	Subatomic
supero-	supero-	(anatomy) Situated above.		Abstract	Spatial	Above
supra-¹	supra-¹	Above, over, on top. (anatomy) Superior.	e.g. supralimbic, supraduction, supracaudal	Abstract	Spatial	Above
supra-²	supra-²	Greater than, transcending.	e.g. supralocal, supracultural, supracontext	Abstract	Transcendence
supra-³	supra-³	Augmentative: intensely, extremely, or exceptional.	e.g. suprahuman, supramassive	Abstract	Normality	Augmentative
supra-⁴	supra-⁴	More than.	e.g. supramillion, supracritical	Abstract	Quantity	More than
sur-¹	sur-¹	Above, on top of.	e.g. suranal, surtop, surangular	Abstract	Spatial	Above
sur-²	sur-²	More than, additional.	e.g. surpass, surabundant, surexpression	Abstract	Quantity	More than
sursum-	sursum-	In an upwards direction.		Abstract	Spatial	Upward
Swahili-	Swahili-	Swahili.		Proper nouns	Languages
symmetro-	symmetro-	Combining form of symmetry.		Abstract	Similarity	Similar
sympatho-	sympatho-	(anatomy) Sympathetic nervous system.		Body parts	Organ systems
syn-¹	sy-¹^[2], syl-¹, sym-¹, syn-¹, sys-¹^[2]	Identical.	e.g. synonym	Abstract	Similarity
syn-²	sy-²^[2], syl-², sym-², syn-², sys-²^[2]	With, together.	example(s) from^[1]: syllable, symbol, synthesis, system	Abstract	Composition	Among
syn-³	sy-³^[2], syl-³, sym-³, syn-³, sys-³^[2]	Concomitant, at the same time.	e.g. synesthesia	Abstract	Temporal
synapto-¹	synapto-¹	(anatomy) Synapse.		Body parts	Nerves
synchro-	synchro-	At the same time, synchronous.		Abstract	Temporal	Synchronous
syndesmo-	syndesmo-	Connective tissue.		Body parts	Connective tissues
synovo-	synovo-	Synovia.		Body parts	Bodily fluids
syphilo-	syphilo-	Syphilis.		Body processes	Pathological
syringo-¹	syringo-¹	Tube, tuboid structure.		Colours, shapes, and textures	Shapes	Cylindrical
syringo-²	syringo-²	(medicine) Fistula.		Body processes	Pathological
Syro-	Syro-	Syria.		Proper nouns	Extant countries	Syria
systemo-	system-, systemo-	System.		Abstract	Composition	Whole
systol-	systol-	Contraction.		Abstract	Motion

T

A	B	C	D	E	F	G	H	I	K	L	M	N	O	P	Q	R	S	T	U	V	W	X	Y	Z	References

Prefixes that start with T.
Prefix	All forms	Definition	Example	Category	Subcat	Alt-Sort
T-	T-	(media) Thai; used to denote nouns relating to the (popular) culture of Thailand.		Proper nouns	Popular culture
tachy-	tachi-, tacho-, tachy-	Fast, rapid, speed.	example(s) from^[2]: tachycardia, tachypnea	Abstract	Rates	Fast
Tagalo-	Tagalo-	Tagalog.		Proper nouns	Languages
Tajiko-	Tajiko-	Tajikistaan, Tajik.		Proper nouns	Extant countries	Tajikistan
talo-	talo-	(anatomy) Talus.		Body parts	Bones
tanta-	tanta-	Tantalum.	e.g. tantalate, tantalous	Chemical substances	Elements	73
Tanza-	Tanza-	Tanzania, Tanzanian.		Proper nouns	Extant countries	Tanzania
tapho-	tapho-	Grave; burial.		Human activities	Other human activities
tars-	tars-	(anatomy) Of or relating to the tarsus.		Body parts	Bones
tarso-	tarso-	Ankle, foot.		Body parts	Anatomical regions
tartro-	tartro-	(chemistry) Tartar.		Chemical substances	Compounds
Tataro-	Tataro-	Tatarstan, Tatar.		Proper nouns	Historical countries
tauro-	tauro-	(biology) Bull.		Lifeforms	Animals
tauto-	taut-, tauto-	The same, identical.		Abstract	Similarity	Similar
taxo-¹	tax-¹, taxi-¹, taxo-¹	A system of classification, order, arrangement.		Abstract	Basis
tebi-	tebi-	2⁴⁰.		Abstract	Numbers	2⁴⁰
technet-	technet-	Technetium.	e.g. technetic, pertechnetate	Chemical substances	Elements	43
techni-	techni-	(physics) Described using the technicolor model.	e.g. technibaryon, technilepton	Physical properties	Other physical properties	Subatomic
techno-	techno-	Pertaining to technology. Skill, craft.		Academic disciplines	Societal
tecn-	tecn-, tecno-, tekn-	Child.		Life stages	Life cycle	3 - Child
tectono-	tecto-, tectono-	Plate tectonics.	e.g. tectonomagmatic, tectonomorphological, tectonostratigraphy	Landforms and ecosystems	Landforms
tele-¹	tele-¹	Over a distance.	example(s) from^[1]: telegraph, telephone, telescope, television	Abstract	Spatial	Far
tele-²	tele-²	Technologies that operate over a distance: television, telegraph, telephone, etc.	e.g. telethon, telecast, telesale	Technologies	Types of technologies
teleio-	teleio-	Fully grown; adult.		Life stages	Life cycle	6 - Adult
teleo-	teleo-	Purpose, design, intent.	e.g. teleology, teleophobia, teleocracy	Abstract	Intention	Intention
tellur-	tellur-, telluri-, telluro-²	Tellurium.		Chemical substances	Elements	52
telluro-¹	telluro-¹	Earth.		Celestial bodies and their rotations	Solar system	3
telo-	telo-	End, complete.		Abstract	Temporal
tempo-	tempo-	Tempo, time.		Abstract	Temporal
temporo-	temporo-	(anatomy) Temporal; temples .		Body parts	Brain
teno-	tendo-, teno-	Tendon.		Body parts	Connective tissues
tenso-	tenso-	Stretched, strained.		Abstract	Flexibility
tephro-²	tephro-²	(medicine) Gray or ashen.		Colours, shapes, and textures	Shades	2 - Grey
ter-	ter-	Three.		Abstract	Numbers	3
tera-	tera-	Trillion, 10¹².		Abstract	Numbers	10¹²
terato-	terato-	Monstrous, abnormal, deformed.	example(s) from^[2]: teratoma, teratogen	Body processes	Pathological
terb-	terb-	Terbium.	e.g. terbia, terbic	Chemical substances	Elements	65
term-	term-	To limit, end.		Abstract	Completion
tert-	tert-	(chemistry) Tertiary form.		Abstract	Ordinal	3
testiculo-	testiculo-	Testicle.		Body parts	Organs
testo-	testo-	The testes.		Body parts	Organs
tetan-^[2]	tetan-^[2]	(medicine) Rigid, tense^[2].	example(s) from^[2]: tetanus	Abstract	Motion
tetra-	tessara-, tetr-, tetra-, tetrakis-	Four.		Abstract	Numbers	4
tetracosa-	tetracosa-	Twenty-four.		Abstract	Numbers	24
tetradeca-	tetradeca-, tetrakaideca-, tetrakaideka-	Fourteen.		Abstract	Numbers	14
Teuto-	Teuto-, Teutono-	The Teutons, historical Germanic people, or present-day Germans.	e.g. Teutophone	Proper nouns	Extant countries	Germany
th-	th-	(obsolete) The.		Abstract	Specificity
thalamo-	thalamo-, thalmo-	(anatomy) Thalamus.		Body parts	Brain
thalasso-	thalass-, thalasso-	The sea.		Landforms and ecosystems	Oceanic
thall-	thall-	Thallium.	e.g. thallane, thallous	Chemical substances	Elements	81
thanato-	thanato-	Death.	e.g. thanatochemistry, thanatography, thanatomania	Life stages	Life cycle	9 - Death
thaumato-	thaumat-, thaumato-	Miracle, wonder, marvel.		Social facts	Religion & mythology	Religion
thec-^[2]	thec-^[2]	(medicine) Case, sheath^[2].	example(s) from^[2]: intrathecal	Colours, shapes, and textures	Shapes	Cylindrical
thel-^[2]	thel-^[2]	(medicine) Nipple, teat^[2].	example(s) from^[2]: w:Theleplasty, thelarche	Body parts	Orifices
thely-^[2]	thely-^[2]	(medicine) Pertaining to women; feminine^[2].	example(s) from^[2]: w:Thelygenous	Life stages	Genders	Female
theo-	the-, theo-	Religion, gods, deities.		Social facts	Religion & mythology	Religion
therap-	therap-	Therapeutic, healing.	example(s) from^[2]: hydrotherapy, therapeutic	Human activities	Healing
therio-	theri-, therio-, thero-	Animal, beast.		Lifeforms	Animals
thermo-	therm-, thermo-	Heat.	example(s) from^[2]: hypothermia, thermoregulation	Physical properties	Climactic conditions	Heat
Thessalo-	Thessalo-	Thessaly.		Proper nouns	Historical countries
thia-	thia-	Used to form the names of chemical compounds containing sulfur, especially where a sulfur atom replaces an oxygen atom in an analogous compound.		Chemical substances	Substituents
thigmo-	thigmo-	(biology) Related to touching, usually a plant.	e.g. thigmokinesis, thigmotaxis	Abstract	Influences	Touch
thio-	thi-, thio-	Sulfur. Containing sulfur.		Chemical substances	Elements	16
thoraco-	thora-, thorac-^[2], thoraci-^[2], thoracico-^[2], thoraco-, thorato-	The thorax. Chest.	example(s) from^[2]: thoracic spine, thorax	Body parts	Anatomical regions
thori-	thori-	Thorium.	e.g. thorian, thoric	Chemical substances	Elements	90
thorough-¹	thorough-¹	Through, via.	e.g. thoroughfare, thoroughgo, thoroughlane	Abstract	Routing
thorough-²	thorough-²	Fully, completely.	e.g. thoroughgoingly, thoroughbreed, thoroughpaced	Abstract	Completion
Thraco-	Thraco-	Thracian.		Proper nouns	Historical countries
thre-	thre-, threo-	(chemistry) Pertaining to general organic structures with adjacent chiral centers.		Abstract	Chemical structures
thrombo-	thromb-, thrombo-	Blood clotting.	example(s) from^[2]: thrombus, thrombocytopenia	Body processes	Pathological
thym-^[2]	thym-^[2]	(medicine) Emotions^[2].	example(s) from^[2]: dysthymia	Body processes	Sensory
thymo-	thymo-	(medicine) The thymus.		Body parts	Organs
thyro-	thyr-, thyreo-, thyro-	Thyroid.	e.g. thyroblast, thyrotomy, thyropharyngeal	Body parts	Organs
Tibeto-	Tibeto-	Of or pertaining to Tibet.		Proper nouns	Historical countries
tibio-	tibio-	Tibia.		Body parts	Bones
titano-¹	titano-¹	Titanium.	e.g. titanomagnetite, titanosilicate	Chemical substances	Elements	22
titano-²	titano-²	Huge, very large, enormous.		Abstract	Size	Big
to-⁰¹	to-⁰¹	(non-productive) Parting: forming verbs that involve cleaving, breaking, or sundering.	e.g. tocrack, togrind, torend	Abstract	Composition	Un-joining
to-⁰²	to-⁰²	(non-productive) To do excessively.	e.g. tobeat, topinch, toquake, toruffle	Abstract	Normality	Intensifying
to-⁰³	to-⁰³	(non-productive) Completely.	e.g. tobruise, toreave, torob, toshend	Abstract	Completion
to-⁰⁴	to-⁰⁴	(non-productive) Moving.	e.g. tolug, towind	Abstract	Motion
to-⁰⁵	to-⁰⁵	Current, the current form of the suffixed time. Forming nouns.	e.g. today, tonight, tosol	Abstract	Temporal
to-⁰⁶	to-⁰⁶	On (this) time, which is a fixed point in time. Forming adverbs.	e.g. today, tomorrow, tomorn	Abstract	Temporal
to-⁰⁷	to-⁰⁷	During the suffixed time. Forming adverbs.	e.g. today, tonight, toyear	Abstract	Temporal
to-⁰⁸	to-⁰⁸	Of, as characteristic of the suffixed time period. Forming adverbs and adjectives.	e.g. today, together	Abstract	Origin
to-⁰⁹	to-⁰⁹	At, at the suffixed time. Forming an unfixed point in time, rather than a duration.	e.g. tomorrow, tofall, together	Abstract	Temporal
to-¹⁰	to-¹⁰	Adding, additional in quantity.	e.g. to-bread, to-name	Abstract	Composition	Joining
to-¹¹	to-¹¹	Toward in direction or location.	e.g. to-draw, tofall, together	Abstract	Spatial
Tocharo-	Tocharo-	Tocharans.		Proper nouns	Historical countries
toco-	toco-, toko-	Childbirth, reproduction.	example(s) from^[2]: tocolytic, dystocia	Body processes	Reproduction
tomo-	tomo-	To cut.		Abstract	Composition	Un-joining
tono-¹	ton-¹^[2], tono-¹	(medicine) Tonus: muscle tone, or tension in an organ.	e.g. tonography, myotonometer, hypotonia	Body processes	Bodily needs and functions
tono-²	ton-²^[2], tono-²	(linguistics) Relating to tone in linguistics.	e.g. tonogenesis, tonomorpheme, tonomorphology	Academic disciplines	Linguistics
tono-³	ton-³^[2], tono-³	Acoustic pitch or musical tone.	e.g. tonoscope, tonotopic, tonotopy	Body processes	Sensory
tono-⁴	ton-⁴^[2], tono-⁴	Tension, tense, or stretched.	e.g. tonofibril, tonoplast	Physical properties	Other physical properties
tonsillo-	tonsillo-	Tonsil.		Body parts	Organs
topo-	top-^[2], topo-	Place, area or region.	example(s) from^[2]: w:Topical anesthetic	Abstract	Basis
tor-	tor-, tors-, tort-, torti-^[2]	To twist. Twisted^[2].	example(s) from^[2]: w:Torticollis, w:Testicular torsion	Abstract	Motion
Tosco-	Tosco-	Tuscany.		Proper nouns	Historical countries
toxi-	tox-, toxi-, toxic-^[2], toxico-, toxo-	Toxic, poison.	example(s) from^[2]: w:Toxoplasmosis, w:Toxidrome	Body processes	Pathological
trachelo-	trachel-, trachelo-	The neck.	example(s) from^[2]: Tracheloplasty	Body parts	Anatomical regions
tracheo-	trache-^[2], trachea-^[2], tracheo-	The trachea.	example(s) from^[2]: w:Tracheotomy	Body parts	Tubes and ducts
trans-¹	trans-¹	Extending across, through, or over.	transnational, transregional, transamerican	Abstract	Spatial
trans-²	trans-²	To or on the other side of, beyond; outside of.	transalpine, transuranic	Abstract	Transcendence
trans-³	trans-³	(chemistry) A compound in which two atoms or groups are situated on opposite sides of some plane of symmetry passing through the compound. (Also used without the hyphen as an adjective; see trans.)	transacetylase, tranexamic acid, transaldolase	Abstract	Spatial
trans-⁴	trans-⁴	Transgender or transsexual, or pertaining to those who are transgender or transsexual.	transmasculine, transfeminist, transphobia	Social facts	Political and social movements
tri-	tri-	Three.	example(s) from^[1]: tricycle, tripartite, triangle, tricolor, trinomial	Abstract	Numbers	3
trib-	trib-	To pay.		Human activities	Other human activities	Economic
tribo-	tribo-	Friction.		Physical properties	Other physical properties
tricho-¹	trich-¹^[2], trich-¹^[2], trichi-¹^[2], trichia-¹^[2], tricho-¹	Hair.	example(s) from^[2]: w:Trichocyst	Body parts	Integument
trideca-	trideca-, triskaideca-, triskaideka-	Thirteen.		Abstract	Numbers	13
trihydro-	trihydro-	(chemistry) Three hydrogen atoms.		Chemical substances	Forms
tris-	tris-	(chemistry) A variant of tri-, used for substitutions of three complex rather than simple units.		Abstract	Ordinal	3
trito-	trit-, trito-	Third.		Abstract	Ordinal	3
trocho-	trocho-	Wheel.		Colours, shapes, and textures	Shapes	Round
trop-	trop-	(pharmacology) Used to form names of atropine derivatives.		Chemical substances	Pharmacological
tropho-	tropho-	Nutrients, food.		Body processes	Bodily needs and functions
tropo-	tropo-	Change, turn, difference.	e.g. tropophobia, tropomorphic, troposphere	Abstract	Similarity	Variety
tru-	tru-	(slang) True, genuine.		Abstract	Correctness	True
trypano-	trypano-	Trypanosome.		Lifeforms	Bacteria
tubo-	tubo-	Tube.		Colours, shapes, and textures	Shapes	Cylindrical
tubul-	tubul-, tubulo-	Tubules, microtubules.		Colours, shapes, and textures	Shapes	Cylindrical
tungsto-	tungsto-	Tungsten.		Chemical substances	Elements	74
Tuniso-	Tuniso-	Tunisia, Tunisian.		Proper nouns	Extant countries	Tunisia
turbo-¹	turbo-¹	A turbine.	e.g. turboprop, turboalternator, turboshaft	Technologies	Tools and machine components
turbo-²	turbo-²	To accelerate.		Abstract	Rates
Turco-	Turco-, Turko-	Turkish, Turkey.	e.g. Turkophone	Proper nouns	Extant countries	Turkey
Turdetano-	Turdetano-	Turdetani, Turdetania.		Proper nouns	Historical countries
Turkmeno-	Turkmeno-	Turkmen, Turkmenistan.		Proper nouns	Extant countries	Turkmeninstan
twi-¹	twi-¹	Two, having two.	e.g. twi-headed, twi-coloured, twifaced	Abstract	Numbers	2
twi-²	twi-²	Second.	e.g. twilight, twichild, twifallow	Abstract	Ordinal	2
tympano-	tympan-, tympano-	The eardrum.	example(s) from^[2]: w:Tympanocentesis, w:Tensor tympani	Body parts	Ears
typhl-	typhl-, typhlo-	Blindness.		Body processes	Pathological
typo-	typ-, typo-	Print, writing, typography.	e.g. typolithography, typometer, typophile	Technologies	Communication technologies
tyranno-	tyranno-, tyrrano-	Tyranny; tyrannical.		Social facts	Political movements
tyro-	tyro-	Cheese.	e.g. tyrosine, tyrotoxin, tyromancy	Chemical substances	Foods
Tyrrheno-	Tyrrheno-	Tyrrhenia (Etruria).		Proper nouns	Historical countries

U

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Prefixes that start with U.
Prefix	All forms	Definition	Example	Category	Subcat	Alt-Sort
uber-	uber-, über-	Augmentative: super; really; mega-.	e.g. uberdork, ubergeek	Abstract	Normality	Augmentative
udi-	udi-	(soil science) Udic.		Physical properties	Climactic conditions	Humidity
Ugando-	Ugando-	Uganda.		Proper nouns	Extant countries	Uganda
Ugro-	Ugro-	Ugric, Ugrian.		Proper nouns	Historical countries
Ukraino-	Ukraino-, Ukro-	Ukranian.	e.g. Ukrainophone	Proper nouns	Extant countries	Ukraine
ulcero-	ulcero-	Ulcer.		Body processes	Pathological
ulno-	ulno-	The ulna bone.		Body parts	Bones
ulo-	ulo-	Scar.		Body processes	Pathological
ulter-	ulter-	Beyond, farther.		Abstract	Transcendence
ultima-	ultima-	Last, final.		Abstract	Temporal	1 - Final
ultra-¹	ultra-¹	Greater than normal quantity or importance.	e.g. ultrasecret	Abstract	Quantity	More than
ultra-²	ultra-²	Beyond, on the far side of.	e.g. ultraviolet	Abstract	Spatial	Opposite
ultra-³	ultra-³	Beyond, outside of.	e.g. ultrasonic	Abstract	Spatial	Outside
ultra-⁴	ultra-⁴	Augmentative: intensely, extremely, or exceptional. Excessively, to an extreme.	example(s) from^[1]: ultramicroscopic, ultra-careful	Abstract	Normality	Augmentative
ulvu-	ulvu-	Uvula.		Body parts	Organs
um-	um-, umb-, umbe-	Around, about.	example(s) from^[1]: umbestound	Abstract	Spatial	Around
umbilic-	umbilic-, umbilico-	Umbilical cord, navel.	e.g. umbilicoplacental, umbilicoplasty	Body parts	Anatomical regions
umbra-	umbra-	Shadow.		Colours, shapes, and textures	Shades	3 - Dark
Umbro-	Umbro-	Pertaining to Umbria or Umbrian.		Proper nouns	Historical countries
un-¹	un-¹	Not.	e.g. uneducated, unknown, unklocked	Abstract	Negation
un-²	un-²	Lack of.	e.g. unconformity, unemployed	Abstract	Insufficiency
un-³	un-³	Contrary to traditional norms, unconventional.	e.g. unschooling, unconference	Abstract	Similarity	Different
undeca-	undeca-	Eleven.		Abstract	Numbers	11
under-¹	under-¹	Beneath, under.	e.g. underpass, underground, underneath	Abstract	Spatial	Beneath
under-²	under-²	To progress along a path (metaphorical).	e.g. understand, undergo, underbear, undertake	Abstract	Completion
under-³	under-³	Less than, beneath in quantity .	e.g. underadditive, underage, underbound	Abstract	Quantity	Less than
under-⁴	under-⁴	Deficient.	e.g. underapply, underbill, underawe	Abstract	Insufficiency
under-⁵	under-⁵	Subordinate to.	e.g. undersecretary, underling	Abstract	Ranking
ungui-^[2]	ungui-^[2], unguo-	Nail, claw.	example(s) from^[2]: unguiform, ungual	Body parts	Integument
uni-	uni-	One, single.	example(s) from^[1]: unicycle, universal	Abstract	Numbers	1
up-¹	up-¹	Increase.	e.g. uprate	Abstract	Rates
up-²	up-²	Upwards; ised to indicate higher position or direction, literally or figuratively..	example(s) from^[1]: upgrade, uplift, upright	Abstract	Spatial	Upward
ur-	ur-	Original, primitive, earliest.	e.g. ur-ancestor, urlanguage	Abstract	Temporal	0 - First
Uralo-	Uralo-	Uralic languages.		Proper nouns	Languages
uran-	uran-	(chemistry) Uranite.	e.g. uranite, uranitic	Chemical substances	Elements	92
urano-¹	urano-¹	Uranus. Also used for the heavens more broadly.		Celestial bodies and their rotations	Solar system	7
urano-²	urano-²	(anatomy) Palate.		Body parts	Anatomical regions
uranoso-	uranoso-	(chemistry) Uranous.		Chemical substances	Elements	92
Urdu-	Urdu-	Urdu.	e.g. Urduphone	Proper nouns	Languages
ureido-	ureido-	(chemistry) Ureylene. Containing the univalent radical NH₂CONH–.		Chemical substances	Radicals
ureo-	ure-, ureo-	Urea.		Chemical substances	Biochemistry
uretero-	uretero-, ureto-	(anatomy) Ureter.		Body parts	Tubes and ducts
urethr-	urethr-, urethro-	(anatomy) Urethra.		Body parts	Orifices
uric-	uric-	Urinary condition.		Body processes	Pathological
urino-	ur-, urin-^[2], urino-, uro-¹	Pertaining to urine and the urinary system.	example(s) from^[2]: antidiuretic, diuresis, diuretic, dysuria, enuresis, polyurea, polyuria, uraemia/uremia, uremic, ureter, urethra, urology	Body parts	Organ systems
uro-²	uro-	Tail.		Body parts	Anatomical regions
utero-	uter-^[2], utero-	(anatomy) Uterus.	e.g. uteroabdominal, uteralgia	Body parts	Organs
Uto-	Uto-	Ute languages.		Proper nouns	Languages
utriculo-	utriculo-	(anatomy) utricle.		Body parts	Ears
uveo-	uveo-	Uvea, the middle layer of the eye.		Body parts	Eyes
uvul-	uvul-, uvulo-	Uvula.		Body parts	Organs
Uzbeco-	Uzbeco-	Uzbek, Uzbekistan.		Proper nouns	Extant countries	Uzbekistan

V

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Prefixes that start with V.
Prefix	All forms	Definition	Example	Category	Subcat	Alt-Sort
V-	V-	(media) Vietnamese; used to denote nouns relating to the (popular) culture of Vietnam.		Proper nouns	Popular culture
vac-	vac-	Empty.		Abstract	Fullness	Empty
vacci-	vacci-	Cow, cows.		Lifeforms	Animals
vagino-	vagin-, vagino-	Pertaining to the vagina.	example(s) from^[2]: w:vaginal epithelium	Body parts	Organs
vago-	vago-	(medicine) Pertaining to the vagus nerve.		Body parts	Nerves
val-	val-, valu-	Worth, value.		Social facts	Social institutions	Economic
valero-	valero-	Valerian.		Lifeforms	Plants
valv-	valv-, valvo-, valvul-, valvulo-	Valve.		Colours, shapes, and textures	Shapes	Cylindrical
vanad-	vanad-	Vanadium.	e.g. vanadocene, vanadyl	Chemical substances	Elements	23
vari-	vari-	Various, variety.	e.g. variform, varigauge, varihued	Abstract	Similarity	Variety
varico-	varic-, varico-	(medicine) Varicose vein.	example(s) from^[2]: varicose, w:esophageal varices	Body parts	Tubes and ducts
vas-	vas-	Vas deferens.		Body parts	Tubes and ducts
Vasco-	Basco-, Vasco-	Basque, Basque Country.	e.g. Bascophone	Proper nouns	Languages
vasculo-	vasculo-	Vessels, blood vessels, lymphatic vessels.	e.g. vasculometabolic, vasculopathy	Body parts	Tubes and ducts
vaso-	vaso-	Vessel; (medicine) blood vessels, blood pressure.	example(s) from^[2]: vasoconstriction	Body parts	Tubes and ducts
vegeto-	vegeto-	Vegetable, vegetal.	e.g. vegeto-mineral, vegetoanimal	Lifeforms	Plants
velo-¹	velo-¹	Bicycle, cycling.		Technologies	Transportation
velo-²	velo-²	(anatomy) Velum.		Body parts	Brain
ven-	ven-, veni-, veno-	(medicine) Vein.	example(s) from^[2]: venule, venospasm	Body parts	Tubes and ducts
venero-	venero-	Sexual contact, venereal.		Body processes	Pathological
ventilo-	ventilo-	To aerate, oxygenate.		Body processes	Bodily needs and functions
ventri-	ventr-, ventri-, ventro-	(anatomy) The ventral (belly) side of the body.	example(s) from^[2]: ventrodorsal	Abstract	Spatial
ventriculo-	ventricul-^[2], ventriculo-	(medicine) Ventricle.	example(s) from^[2]: w:cardiac ventriculography, w:atrioventricular node	Body parts	Cavities
ver-	ver-	Truth, correct.		Abstract	Correctness	True
vermi-	vermi-	Worm-shaped, worms.		Lifeforms	Animals
versi-	versi-, verso-, vert-, verti-	Turn, change.		Abstract	Flexibility
vertebro-	vertebro-	Vertebra.		Body parts	Bones
vesico-	vesic-^[2], vesico-	(medicine) Bladder.	example(s) from^[2]: w:vesical arteries	Body parts	Organs
vesiculo-	vesiculo-	Blister.		Body processes	Pathological
vestibulo-	vestibulo-	The ear, balance, vestibular system.		Body parts	Organ systems
vexillo-	vexillo-	Flags.		Technologies	Communication technologies
vibro-	vibro-	Vibration, oscillation, shaking.		Abstract	Motion
vice-	vic-, vice-	Replacement, deputy, assistant.	example(s) from^[1]: vice-president, vice-principal, vice-admiral	Abstract	Ranking
video-	video-	Moving images, especially television.		Technologies	Communication technologies
vigen-	vigen-, viginti-	Twenty.		Abstract	Numbers	20
vin-	vin-	(pharmacology) Vinca alkaloids.		Chemical substances	Pharmacological
viri-	viri-, viro-	Virus.		Body processes	Pathological
viscero-	viscer-^[2], viscero-	(medicine) The viscera, organs.	example(s) from^[2]: viscera	Body parts	Organs
visco-	visco-	Viscous.		Abstract	Mass
visuo-	visuo-	Vision, sight.		Body processes	Sensory
vitello-	vitello-	Egg yolk.		Body parts	Membranes
vitreo-¹	vitreo-¹	Glass.	e.g. vitreography, vitrine	Chemical substances	Materials
vitro-²	vitreo-²	(anatomy) Vitreous body of the eye.	e.g. vitreopapillary, vitreoretinopathy	Body parts	Eyes
Vivaro-	Vivaro-	Vivarais (France).		Proper nouns	Historical countries
vivi-	vivi-, vivo-	Living, alive.	e.g. vivisection	Body processes	Bodily needs and functions
vol-	vol-	Will, volition.		Body processes	Bodily needs and functions
volcan-	volcan-	Volcanoes.		Landforms and ecosystems	Landforms
volt-	volt-	Circular tread, sudden movement.		Abstract	Motion
volvo-	volvo-	Turn about, roll.		Abstract	Spatial
vulvo-	vulvo-	Pertaining to the vulva.		Body parts	Anatomical regions

W

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Prefixes that start with W.
Prefix	All forms	Definition	Example	Category	Subcat	Alt-Sort
wan-	wan-	Bad, lacking.		Abstract	Goodness	Bad
war-	war-	Relating to gaining access to network resources, such as Wi-Fi, by locating and exploiting unprotected access addresses.		Human activities	Other human activities	Violence
were-	were-	Lycanthrope, werewolf.		Social facts	Religion & mythology	Mythology
where-	where-	Which, what, whom.		Abstract	Interrogation
with-¹	with-¹	Against, in opposition to.	e.g. withstand, withsay, withspeak	Abstract	Polarity	Opposition
with-²	with-²	Back, in reverse.	example(s) from^[1]: withstand, withhold	Abstract	Negation
with-³	with-³	Off, out, away, from.	example(s) from^[1]: withstand, withhold	Abstract	Spatial
with-⁴	with-⁴	With, along with, together with.	example(s) from^[1]: withstand, withhold	Abstract	Composition	Among
wither-	wither-	Against.		Abstract	Polarity	Opposition

X

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Prefixes that start with X.
Prefix	All forms	Definition	Example	Category	Subcat	Alt-Sort
xantho-	xanth-, xantho-	Yellow.	example(s) from^[2]: xanthopathy	Colours, shapes, and textures	Hues	3 - Yellow
xen-²	xen-²	Xenon.	e.g. xenic acid, xenonium	Chemical substances	Elements	54
xeno-	xen-¹, xeno-	Foreign.	example(s) from^[2]: xenograft	Abstract	Similarity	Different
xeri-	xeri-	Dry, arid, particularly of a physical environment.	e.g. xeriscape, xeric	Physical properties	Climactic conditions	Humidity
xero-	xer-, xero-	Dry, dryness.	example(s) from^[2]: xerostomia, xeroderma	Physical properties	Climactic conditions	Humidity
xipho-	xiph-^[2], xipho-	In the shape of a sword.	example(s) from^[2]: xiphisternum, xiphoid, xiphoidalgia	Colours, shapes, and textures	Shapes	Cross
xylo-	xyl-, xylo-	Wood, wooden.	e.g. xylophone, xylohexaose	Chemical substances	Materials
xyr-	xyr-, xyro-	Razor, razor-like.		Colours, shapes, and textures	Shapes	Cylindrical

Y

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Prefixes that start with Y.
Prefix	All forms	Definition	Example	Category	Subcat	Alt-Sort
y-	a-⁰⁸, i-¹, y-	Obsolete prefix used to form past participles.	example(s) from^[1]: yclad, yclept (both archaic words)	Abstract	Temporal	4 - Past
yester-	yester-	Yesterday, previous.		Abstract	Temporal	4 - Past
yobi-	yobi-	2⁸⁰ = 1,024⁸.		Abstract	Numbers	2⁸⁰
yocto-	yocto-	×10^-24.		Abstract	Numbers	10^-24
yotta-	yotta-	×10²⁴.		Abstract	Numbers	10²⁴
yttro-	yttro-	Yttrium.		Chemical substances	Elements	39
Yugo-	Yugo-	Yugoslavia, Yugoslavian.		Proper nouns	Historical countries

Z

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Prefixes that start with Z.
Prefix	All forms	Definition	Example	Category	Subcat	Alt-Sort
Zarma-	Zarma-	Zarma languages.	e.g. Zarmaphone	Proper nouns	Languages
ze-^[2]	ze-^[2]	(medicine) Boil^[2].	example(s) from^[2]: eczema	Body processes	Pathological
zebi-	zebi-	2⁷⁰ = 1,024⁷.		Abstract	Numbers	2⁷⁰
zeno-	zeno-	Jupiter.		Celestial bodies and their rotations	Solar system	5
zepto-	zepto-	×10^-21.		Abstract	Numbers	10^-21
zetta-	zetta-	×10²¹.		Abstract	Numbers	10²¹
zinco-	zinco-	Pertaining to zinc.		Chemical substances	Elements	30
zirco-	zirco-	Zirconium.		Chemical substances	Elements	40
zono-	zono-	Zone; zonal.		Abstract	Basis
zoo-	zo-, zoo-, zoö-	Animal.	example(s) from^[2]: zoology	Lifeforms	Animals
zygo-	zyg-, zygo-	Joining or pairing; union, pair.		Abstract	Composition	Joining
zygomatico-	zygomatico-	(anatomy) Zygomatic.		Body parts	Bones
zym-	zym-, zymo-	Enzymes, fermentation.	example(s) from^[2]: enzyme, lysozyme	Chemical substances	Biochemistry

References

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↑ ^1.00 ^1.01 ^1.02 ^1.03 ^1.04 ^1.05 ^1.06 ^1.07 ^1.08 ^1.09 ^1.10 ^1.11 ^1.12 ^1.13 ^1.14 ^1.15 ^1.16 ^1.17 ^1.18 ^1.19 ^1.20 ^1.21 ^1.22 ^1.23 ^1.24 ^1.25 ^1.26 ^1.27 ^1.28 ^1.29 ^1.30 ^1.31 ^1.32 ^1.33 ^1.34 ^1.35 ^1.36 ^1.37 ^1.38 ^1.39 ^1.40 ^1.41 ^1.42 Cite error: Invalid <ref> tag; no text was provided for refs named wikipeng
↑ ^2.000 ^2.001 ^2.002 ^2.003 ^2.004 ^2.005 ^2.006 ^2.007 ^2.008 ^2.009 ^2.010 ^2.011 ^2.012 ^2.013 ^2.014 ^2.015 ^2.016 ^2.017 ^2.018 ^2.019 ^2.020 ^2.021 ^2.022 ^2.023 ^2.024 ^2.025 ^2.026 ^2.027 ^2.028 ^2.029 ^2.030 ^2.031 ^2.032 ^2.033 ^2.034 ^2.035 ^2.036 ^2.037 ^2.038 ^2.039 ^2.040 ^2.041 ^2.042 ^2.043 ^2.044 ^2.045 ^2.046 ^2.047 ^2.048 ^2.049 ^2.050 ^2.051 ^2.052 ^2.053 ^2.054 ^2.055 ^2.056 ^2.057 ^2.058 ^2.059 ^2.060 ^2.061 ^2.062 ^2.063 ^2.064 ^2.065 ^2.066 ^2.067 ^2.068 ^2.069 ^2.070 ^2.071 ^2.072 ^2.073 ^2.074 ^2.075 ^2.076 ^2.077 ^2.078 ^2.079 ^2.080 ^2.081 ^2.082 ^2.083 ^2.084 ^2.085 ^2.086 ^2.087 ^2.088 ^2.089 ^2.090 ^2.091 ^2.092 ^2.093 ^2.094 ^2.095 ^2.096 ^2.097 ^2.098 ^2.099 ^2.100 ^2.101 ^2.102 ^2.103 ^2.104 ^2.105 ^2.106 ^2.107 ^2.108 ^2.109 ^2.110 ^2.111 ^2.112 ^2.113 ^2.114 ^2.115 ^2.116 ^2.117 ^2.118 ^2.119 ^2.120 ^2.121 ^2.122 ^2.123 ^2.124 ^2.125 ^2.126 ^2.127 ^2.128 ^2.129 ^2.130 ^2.131 ^2.132 ^2.133 ^2.134 ^2.135 ^2.136 ^2.137 ^2.138 ^2.139 ^2.140 ^2.141 ^2.142 ^2.143 ^2.144 ^2.145 ^2.146 ^2.147 ^2.148 ^2.149 ^2.150 ^2.151 ^2.152 ^2.153 ^2.154 ^2.155 ^2.156 ^2.157 ^2.158 ^2.159 ^2.160 ^2.161 ^2.162 ^2.163 ^2.164 ^2.165 ^2.166 ^2.167 ^2.168 ^2.169 ^2.170 ^2.171 ^2.172 ^2.173 ^2.174 ^2.175 ^2.176 ^2.177 ^2.178 ^2.179 ^2.180 ^2.181 ^2.182 ^2.183 ^2.184 ^2.185 ^2.186 ^2.187 ^2.188 ^2.189 ^2.190 ^2.191 ^2.192 ^2.193 ^2.194 ^2.195 ^2.196 ^2.197 ^2.198 ^2.199 ^2.200 ^2.201 ^2.202 ^2.203 ^2.204 ^2.205 ^2.206 ^2.207 ^2.208 ^2.209 ^2.210 ^2.211 ^2.212 ^2.213 ^2.214 ^2.215 ^2.216 ^2.217 ^2.218 ^2.219 ^2.220 ^2.221 ^2.222 ^2.223 ^2.224 ^2.225 ^2.226 ^2.227 ^2.228 ^2.229 ^2.230 ^2.231 ^2.232 ^2.233 ^2.234 ^2.235 ^2.236 ^2.237 ^2.238 ^2.239 ^2.240 ^2.241 ^2.242 ^2.243 ^2.244 ^2.245 ^2.246 ^2.247 ^2.248 ^2.249 ^2.250 ^2.251 ^2.252 ^2.253 ^2.254 ^2.255 ^2.256 ^2.257 ^2.258 ^2.259 ^2.260 ^2.261 ^2.262 ^2.263 ^2.264 ^2.265 ^2.266 ^2.267 ^2.268 ^2.269 ^2.270 ^2.271 ^2.272 ^2.273 ^2.274 ^2.275 ^2.276 ^2.277 ^2.278 ^2.279 ^2.280 ^2.281 ^2.282 ^2.283 ^2.284 ^2.285 ^2.286 ^2.287 ^2.288 ^2.289 ^2.290 ^2.291 ^2.292 ^2.293 ^2.294 ^2.295 ^2.296 ^2.297 ^2.298 ^2.299 Wikipedia contributors. (2024, February 17). List of medical roots, suffixes and prefixes. In Wikipedia, The Free Encyclopedia. Retrieved 09:05, February 17, 2024, from https://en.wikipedia.orghttps://en.wiktionary.org/w/index.php?title=List_of_medical_roots,_suffixes_and_prefixes&oldid=1208358797
↑ ^3.0 ^3.1 ^3.2 Cite error: Invalid <ref> tag; no text was provided for refs named optom
^ Jack Sullivan. Some Greek and Latin word roots-. Accessed from https://www.webpages.uidaho.edu/~jacks/etymology.pdf 2024-03-03.
^ Stedman's Online, as cited in Wikipedia contributors, "List of medical roots, suffixes and prefixes," Wikipedia, The Free Encyclopedia, https://en.wikipedia.orghttps://en.wiktionary.org/w/index.php?title=List_of_medical_roots,_suffixes_and_prefixes&oldid=1208358797 (accessed February 23, 2024).
^ Oxford English Dictionary, s.v. “re- (prefix),” December 2023, https://doi.org/10.1093/OED/1031113569.
↑ ^7.0 ^7.1 ^7.2 ^7.3 Warren, H. C. (2018). Dictionary of psychology. Routledge. Retrieved on 2024-02-17 from https://www-taylorfrancis-com.proxy3.library.mcgill.ca/books/mono/10.4324/9780429462221/dictionary-psychology-howard-warren

[wikipeng-1] 1.00 ^1.01 ^1.02 ^1.03 ^1.04 ^1.05 ^1.06 ^1.07 ^1.08 ^1.09 ^1.10 ^1.11 ^1.12 ^1.13 ^1.14 ^1.15 ^1.16 ^1.17 ^1.18 ^1.19 ^1.20 ^1.21 ^1.22 ^1.23 ^1.24 ^1.25 ^1.26 ^1.27 ^1.28 ^1.29 ^1.30 ^1.31 ^1.32 ^1.33 ^1.34 ^1.35 ^1.36 ^1.37 ^1.38 ^1.39 ^1.40 ^1.41 ^1.42 Cite error: Invalid <ref> tag; no text was provided for refs named wikipeng

[wikipmed-2] 2.000 ^2.001 ^2.002 ^2.003 ^2.004 ^2.005 ^2.006 ^2.007 ^2.008 ^2.009 ^2.010 ^2.011 ^2.012 ^2.013 ^2.014 ^2.015 ^2.016 ^2.017 ^2.018 ^2.019 ^2.020 ^2.021 ^2.022 ^2.023 ^2.024 ^2.025 ^2.026 ^2.027 ^2.028 ^2.029 ^2.030 ^2.031 ^2.032 ^2.033 ^2.034 ^2.035 ^2.036 ^2.037 ^2.038 ^2.039 ^2.040 ^2.041 ^2.042 ^2.043 ^2.044 ^2.045 ^2.046 ^2.047 ^2.048 ^2.049 ^2.050 ^2.051 ^2.052 ^2.053 ^2.054 ^2.055 ^2.056 ^2.057 ^2.058 ^2.059 ^2.060 ^2.061 ^2.062 ^2.063 ^2.064 ^2.065 ^2.066 ^2.067 ^2.068 ^2.069 ^2.070 ^2.071 ^2.072 ^2.073 ^2.074 ^2.075 ^2.076 ^2.077 ^2.078 ^2.079 ^2.080 ^2.081 ^2.082 ^2.083 ^2.084 ^2.085 ^2.086 ^2.087 ^2.088 ^2.089 ^2.090 ^2.091 ^2.092 ^2.093 ^2.094 ^2.095 ^2.096 ^2.097 ^2.098 ^2.099 ^2.100 ^2.101 ^2.102 ^2.103 ^2.104 ^2.105 ^2.106 ^2.107 ^2.108 ^2.109 ^2.110 ^2.111 ^2.112 ^2.113 ^2.114 ^2.115 ^2.116 ^2.117 ^2.118 ^2.119 ^2.120 ^2.121 ^2.122 ^2.123 ^2.124 ^2.125 ^2.126 ^2.127 ^2.128 ^2.129 ^2.130 ^2.131 ^2.132 ^2.133 ^2.134 ^2.135 ^2.136 ^2.137 ^2.138 ^2.139 ^2.140 ^2.141 ^2.142 ^2.143 ^2.144 ^2.145 ^2.146 ^2.147 ^2.148 ^2.149 ^2.150 ^2.151 ^2.152 ^2.153 ^2.154 ^2.155 ^2.156 ^2.157 ^2.158 ^2.159 ^2.160 ^2.161 ^2.162 ^2.163 ^2.164 ^2.165 ^2.166 ^2.167 ^2.168 ^2.169 ^2.170 ^2.171 ^2.172 ^2.173 ^2.174 ^2.175 ^2.176 ^2.177 ^2.178 ^2.179 ^2.180 ^2.181 ^2.182 ^2.183 ^2.184 ^2.185 ^2.186 ^2.187 ^2.188 ^2.189 ^2.190 ^2.191 ^2.192 ^2.193 ^2.194 ^2.195 ^2.196 ^2.197 ^2.198 ^2.199 ^2.200 ^2.201 ^2.202 ^2.203 ^2.204 ^2.205 ^2.206 ^2.207 ^2.208 ^2.209 ^2.210 ^2.211 ^2.212 ^2.213 ^2.214 ^2.215 ^2.216 ^2.217 ^2.218 ^2.219 ^2.220 ^2.221 ^2.222 ^2.223 ^2.224 ^2.225 ^2.226 ^2.227 ^2.228 ^2.229 ^2.230 ^2.231 ^2.232 ^2.233 ^2.234 ^2.235 ^2.236 ^2.237 ^2.238 ^2.239 ^2.240 ^2.241 ^2.242 ^2.243 ^2.244 ^2.245 ^2.246 ^2.247 ^2.248 ^2.249 ^2.250 ^2.251 ^2.252 ^2.253 ^2.254 ^2.255 ^2.256 ^2.257 ^2.258 ^2.259 ^2.260 ^2.261 ^2.262 ^2.263 ^2.264 ^2.265 ^2.266 ^2.267 ^2.268 ^2.269 ^2.270 ^2.271 ^2.272 ^2.273 ^2.274 ^2.275 ^2.276 ^2.277 ^2.278 ^2.279 ^2.280 ^2.281 ^2.282 ^2.283 ^2.284 ^2.285 ^2.286 ^2.287 ^2.288 ^2.289 ^2.290 ^2.291 ^2.292 ^2.293 ^2.294 ^2.295 ^2.296 ^2.297 ^2.298 ^2.299 Wikipedia contributors. (2024, February 17). List of medical roots, suffixes and prefixes. In Wikipedia, The Free Encyclopedia. Retrieved 09:05, February 17, 2024, from https://en.wikipedia.orghttps://en.wiktionary.org/w/index.php?title=List_of_medical_roots,_suffixes_and_prefixes&oldid=1208358797

[optom-3] 3.0 ^3.1 ^3.2 Cite error: Invalid <ref> tag; no text was provided for refs named optom

[uidaho-4] Jack Sullivan. Some Greek and Latin word roots-. Accessed from https://www.webpages.uidaho.edu/~jacks/etymology.pdf 2024-03-03.

[Stedman-5] Stedman's Online, as cited in Wikipedia contributors, "List of medical roots, suffixes and prefixes," Wikipedia, The Free Encyclopedia, https://en.wikipedia.orghttps://en.wiktionary.org/w/index.php?title=List_of_medical_roots,_suffixes_and_prefixes&oldid=1208358797 (accessed February 23, 2024).

[oed-6] Oxford English Dictionary, s.v. “re- (prefix),” December 2023, https://doi.org/10.1093/OED/1031113569.

[warren-7] 7.0 ^7.1 ^7.2 ^7.3 Warren, H. C. (2018). Dictionary of psychology. Routledge. Retrieved on 2024-02-17 from https://www-taylorfrancis-com.proxy3.library.mcgill.ca/books/mono/10.4324/9780429462221/dictionary-psychology-howard-warren

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Appendix:English prefixes/M-Z

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References

Wikious

Boobota

Sagapedia