Concave
/ˈkɑn.keɪv/ adj, noun, verb
adj, noun, verb ·Common ·High school level
Definitions
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.
"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.
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- 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.
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. not-comparable
- 3 Satisfying the property that all segments connecting two points on the function's graph lie below the function. not-comparable
- 4 Hollow; empty.
"as concave […] as a worm-eaten nut"
Adjective
- 1 curving inward wordnet
Example
More examples"The moon's orbit is always concave toward the sun."
Etymology
From Middle English concave, from Old French concave, from Latin concavus.