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Added 9 October 2026

concave

/ˈkɒn.keɪv/ adjective

In Latin: concavus Wiktionary

adjective Definition from Wiktionary (CC BY-SA). Pronunciation from Wiktionary, via Kaikki.org. More about concave at Wordnik → Where our words come from →

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

noun

A concave surface or curve.
The vault of the sky.
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).

verb

To render concave, or increase the degree of concavity.

Origin

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

From Wiktionary, via Kaikki.org (CC BY-SA)

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