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concave

Pronunciation: /ˈkɒn.keɪv/

The English word “concave” has 12 meanings listed here.

adjective

  1. Curved like the inner surface of a sphere or bowl.
  2. Not convex; having at least one internal angle greater than 180 degrees.
  3. Satisfying the property that all segments connecting two points on the function's graph lie below the function.
  4. Hollow; empty.

noun

  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.
  4. An element of a curved grid used to separate desirable material from tailings or chaff in mining and harvesting.
  5. An indentation running along the base of a surfboard, intended to increase lift.
  6. An indented area on the top of a skateboard, providing a position for foot placement and increasing board strength.
  7. A playing card made concave for use in cheating.

verb

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

Etymology

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

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.