-itis

From New Latin -itis, from Ancient Greek -ῖτις (-îtis, “pertaining to”). This is the feminine form of adjectival suffix -ῑ́της (-ī́tēs). The English suffix derives from the feminine form due to its use with the feminine noun νόσος (nósos, “disease”), particularly with ἀρθρῖτις (νόσος) (arthrîtis (nósos), “disease of the joints”) (one of the earliest English borrowings from which the suffix was extracted and abstracted).^[1] Humorous sense by generalization.

• IPA^(key): /-ˈaɪtɪs/

• Audio (Southern England):

  (file)

-itis (usually uncountable, plural sometimes -itides or rarely -itises)

1. (pathology) Suffix denoting diseases characterized by inflammation, itself often caused by an infection.
2. (humorous) Used to form the names of various fictitious afflictions or diseases.
   • What to Do About Senioritis: Make Your Senior Year Count, College Board. Accessed April 4, 2008.^[2]

While most of the derived terms theoretically have plurals in -itides (from the Ancient Greek -ῑ́τῐδες (-ī́tĭdes), plural of -ῖτῐς (-îtĭs)), -itises (the regularized English plural), or both, these forms are rarely used, as the derived terms are mass nouns, so their plurals are called for only when referring to types. For example, hepatitides or hepatitises as "types of hepatitis" have some currency in the medical literature, but most other such plurals do not. There is a tendency in formal writing to prefer the classical suffix (when a plural is invoked at all); a typical example is that for the plural of arthritis referring to various types of arthritis, only arthritides is standard.

• itis

• English dictionary of medical terms

• IIST, IITs, SITI, is it

From New Latin -ītis, from Ancient Greek -ῖτις (-îtis).

-itis f (noun-forming suffix, invariable)

1. (pathology) -itis

• “-itis” in Diccionari de la llengua catalana, segona edició, Institut d’Estudis Catalans.
• “-itis”, in Gran Diccionari de la Llengua Catalana, Grup Enciclopèdia Catalana, 2025
• “-itis” in Diccionari normatiu valencià, Acadèmia Valenciana de la Llengua.

• Audio:

  (file)

• Audio:

  (file)

-itis f

1. -itis

Borrowed from English -itis, French -itis, Italian -ite, Portuguese -ite/Spanish -itis, Russian -ит (-it), all ultimately from New Latin -itis, from Ancient Greek -ῖτις (-îtis).

• IPA^(key): /ˈitis/

1=n

-itis

1. forms nouns from nouns, denoting an inflammitory disease; -itis

   ‎appendice (“appendix”) + ‎-itis → ‎appendicitis (“appendicitis”)

   ‎esophago (“oesophagus”) + ‎-itis → ‎esophagitis (“oesophagitis”)

   ‎larynge (“larynx”) + ‎-itis → ‎laryngitis (“laryngitis”)

• Alexander Gode, Hugh E. Blair (1955) Interlingua: A Grammar of the International Language, →ISBN

Learned borrowing from Ancient Greek -ῖτις (-îtis, “pertaining to”).

• (Classical Latin) IPA^(key): /ˈiː.tis/,
• (modern Italianate Ecclesiastical) IPA^(key): /ˈi.tis/,

-ītis f (genitive -ītidis); third declension

1. (New Latin, pathology) -itis (suffix denoting diseases characterized by inflammation, itself often caused by an infection)

Third-declension noun.

See -ītēs.

• (Classical Latin) IPA^(key): /ˈiː.tiːs/,
• (modern Italianate Ecclesiastical) IPA^(key): /ˈi.tis/,

-ītīs

1. dative/ablative plural of -ītēs

Borrowed from New Latin -ītis, from Ancient Greek -ῖτις (-îtis, “pertaining to”).

-itis f (noun-forming suffix, plural -itis)

1. (pathology) -itis (denotes diseases characterized by inflammation, itself often caused by an infection)
2. (humorous) -itis (forms the names of various fictitious afflictions or diseases)

• “-itis”, in Diccionario de la lengua española [Dictionary of the Spanish Language] (in Spanish), online version 23.8, Royal Spanish Academy [Spanish: Real Academia Española], 2024 December 10