Wiktionary

concave

English

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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.

Etymology

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From Middle English concave, from Old French concave, from Latin concavus.

Pronunciation

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  • (UK) IPA(key): /ˈkɒn.keɪv/, /kɒnˈkeɪv/
  • (US) IPA(key): /ˈkɑn.keɪv/, /kɑnˈkeɪv/, /kənˈkeɪv/
    • Audio (US):(file)

Adjective

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concave (comparative more concave, superlative most concave)

  1. Curved like the inner surface of a sphere or bowl.
  2. (geometry, not comparable, of a polygon) Not convex; having at least one internal angle greater than 180 degrees.
  3. (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.
  4. Hollow; empty.

Antonyms

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Derived terms

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Translations

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Noun

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concave (plural concaves)

  1. A concave surface or curve.
  2. The vault of the sky.
  3. 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).
  4. (manufacturing) An element of a curved grid used to separate desirable material from tailings or chaff in mining and harvesting.
  5. (surfing) An indentation running along the base of a surfboard, intended to increase lift.
  6. (skateboarding) An indented area on the top of a skateboard, providing a position for foot placement and increasing board strength.
  7. (gambling) A playing card made concave for use in cheating.
    Coordinate term: convex

Translations

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Verb

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concave (third-person singular simple present concaves, present participle concaving, simple past and past participle concaved)

  1. To render concave, or increase the degree of concavity.

Derived terms

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Translations

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French

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Etymology

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Inherited from Old French concave, borrowed from Latin concavus.

Pronunciation

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Adjective

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concave (plural concaves)

  1. concave

Descendants

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  • → Turkish: konkav

Further reading

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Italian

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Adjective

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concave

  1. feminine plural of concavo

Latin

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Adjective

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concave

  1. vocative masculine singular of concavus
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