concave
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English
[edit]
Bottom: a spoon with its concave side up.
Etymology
[edit]From Middle English concave, from Old French concave, from Latin concavus.
Pronunciation
[edit]Adjective
[edit]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[ward] Blount, published 1623, →OCLC, [Act III, scene iv]:
- as concave […] as a worm-eaten nut
Antonyms
[edit]Derived terms
[edit]Translations
[edit]curved inward
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Noun
[edit]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 [Fire] 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
[edit]A concave surface or curve
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Verb
[edit]concave (third-person singular simple present concaves, present participle concaving, simple past and past participle concaved)
Derived terms
[edit]Translations
[edit]To render concave, or increase the degree of concavity.
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French
[edit]Etymology
[edit]Inherited from Old French concave, borrowed from Latin concavus.
Pronunciation
[edit]Audio: (file)
Adjective
[edit]concave (plural concaves)
Descendants
[edit]- → Turkish: konkav
Further reading
[edit]- “concave”, in Trésor de la langue française informatisé [Digitized Treasury of the French Language], 2012.
Italian
[edit]Adjective
[edit]concave
Latin
[edit]Adjective
[edit]concave
Categories:
- English terms derived from Proto-Indo-European
- English terms derived from the Proto-Indo-European root *ḱewh₁-
- English terms inherited from Middle English
- English terms derived from Middle English
- English terms derived from Old French
- English terms derived from Latin
- English 2-syllable words
- English terms with IPA pronunciation
- English terms with audio links
- English lemmas
- English adjectives
- en:Geometry
- en:Functional analysis
- English terms with quotations
- English nouns
- English countable nouns
- en:Manufacturing
- en:Surfing
- en:Skateboarding
- en:Gambling
- English verbs
- French terms inherited from Old French
- French terms derived from Old French
- French terms borrowed from Latin
- French terms derived from Latin
- French terms with audio links
- French lemmas
- French adjectives
- Italian non-lemma forms
- Italian adjective forms
- Latin non-lemma forms
- Latin adjective forms