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Vinony

concave

adjective

No English definition recorded for this entry.

L313125 on Wikidata ↗

Wiktionary

Pronunciation: /ˈkɒn.keɪv/ / /kɒnˈkeɪv/ / /ˈkɑn.keɪv/

adj

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

  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.

    “as concave […] as a worm-eaten nut”

noun

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

  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. 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

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

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