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concave

adj
/ˈkɒn.keɪv/UK/ˈkɑn.keɪv/US

Etymology

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

  1. derived from concavus
  2. derived from concave
  3. inherited from concave

Definitions

  1. Curved like the inner surface of a sphere or bowl.

  2. Not convex

    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…

    Satisfying the property that all segments connecting two points on the function's graph lie below the function.

  4. ›+ 9 more definitions

    1. Hollow

      Hollow; empty.

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

    2. A concave surface or curve.

    3. The vault of the sky.

    4. 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).

    5. An element of a curved grid used to separate desirable material from tailings or chaff in…

      An element of a curved grid used to separate desirable material from tailings or chaff in mining and harvesting.

    6. An indentation running along the base of a surfboard, intended to increase lift.

    7. An indented area on the top of a skateboard, providing a position for foot placement and…

      An indented area on the top of a skateboard, providing a position for foot placement and increasing board strength.

    8. A playing card made concave for use in cheating.

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

The neighborhood

Derived

biconcave, concavation, concave envelope, concave function, concavely, concaveness, concavification, concavify, concavity, concavoconcave, convexoconcave, double concave, nonconcave, planoconcave, proconcave, pseudoconcave, quasiconcave, subconcave, upper concave envelope

Vish — recursive loop

A definitional loop anchored at concave. Each word in the ring is defined by the next; follow the chain far enough and it folds back on itself. Scroll to it and watch.

01concave02sphere03celestial04moon05lunar06crescent

A definitional loop anchored at concave. Each word in the ring appears in the definition of the next; follow the chain far enough and it folds back on itself.

6 hops · closes at concave

curated · pre-corpus. live cycle detection across the full graph is the next major milestone.

sense glosses and etymology drawn from English Wiktionary · source · CC-BY-SA