concave.
Curved like the inner surface of a sphere or bowl.
Meaning & usage
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.
Hollow; empty.
Where this word comes from
From Middle English concave, from Old French concave, from Latin concavus.
A concave surface or curve.
The vault of the sky.
One of the celestial spheres of the Ptolemaic or geocentric model of the world.
An element of a curved grid used to separate desirable material from tailings or chaff in mining and harvesting.
An indentation running along the base of a surfboard, intended to increase lift.
An indented area on the top of a skateboard, providing a position for foot placement and increasing board strength.
A playing card made concave for use in cheating.
Where this word comes from
From Middle English concave, from Old French concave, from Latin concavus.
To render concave, or increase the degree of concavity.
Where this word comes from
From Middle English concave, from Old French concave, from Latin concavus.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.