concave
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Top: a spoon with its convex side up.
Bottom: a spoon with its concave side up. 
A concave polygon. 
A concave (concave downwards) function.
English
Bottom: a spoon with its concave side up.
Etymology
From Middle English concave, from Old French concave, from Latin concavus.
Pronunciation
Adjective
concave (comparative more concave, superlative most concave)
- Curved like the inner surface of a sphere or bowl.
- (geometry, not comparable, of a polygon) Not convex; having at least one internal angle greater than 180 degrees.
- (functional analysis, not comparable, of a real-valued function on the reals) Satisfying the property that all segments connecting two points on the function's graph lie below the function.
- Hollow; empty.
- c. 1598–1600 (date written), William Shakespeare, “As You Like It”, in Mr. William Shakespeares Comedies, Histories, & Tragedies (First Folio), London: Isaac Iaggard, and Ed Blount, published 1623, →OCLC, :
- as concave […] as a worm-eaten nut
Antonyms
Derived terms
Translations
curved inward
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Noun
concave (plural concaves)
- A concave surface or curve.
- The vault of the sky.
- One of the celestial spheres of the Ptolemaic or geocentric model of the world.
- Aristotle makes to move to the concave of the Moon. - Thomas Salusbury (1661).
- (manufacturing) An element of a curved grid used to separate desirable material from tailings or chaff in mining and harvesting.
- (surfing) An indentation running along the base of a surfboard, intended to increase lift.
- (skateboarding) An indented area on the top of a skateboard, providing a position for foot placement and increasing board strength.
- (gambling) A playing card made concave for use in cheating.
- Coordinate term: convex
Translations
A concave surface or curve
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Verb
concave (third-person singular simple present concaves, present participle concaving, simple past and past participle concaved)
Derived terms
Translations
To render concave, or increase the degree of concavity.
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French
Etymology
Inherited from Old French concave, borrowed from Latin concavus.
Pronunciation
Audio: (file)
Adjective
concave (plural concaves)
Descendants
- → Turkish: konkav
Further reading
- “concave”, in Trésor de la langue française informatisé , 2012.
Italian
Adjective
concave
Latin
Adjective
concave