concave

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English[edit]

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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 function.

Etymology[edit]

From Old French concave, from Latin concavus.

Pronunciation[edit]

  • (file)

Adjective[edit]

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
    • Shakespeare
      as concave [] as a worm-eaten nut

Antonyms[edit]

Translations[edit]

Derived terms[edit]

Noun[edit]

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.

Translations[edit]

Verb[edit]

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.

Translations[edit]

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Italian[edit]

Adjective[edit]

concave

  1. feminine plural of concavo

Latin[edit]

Adjective[edit]

concave

  1. vocative masculine singular of concavus