CONCAVE

The word 'concave' means '' curving in'' or ''hollowed inward''. The term is most commonly used to refer to:

★ Concave lens, a lens with inward-curving (concave) surfaces.

★ Concave polygon, a polygon which is not convex.

★ Concave function, a type of function which is related to convex functions.
In addition, the term 'concave upwards' is used for convex functions, and 'concave downwards' for concave functions.

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See also

See also

★ Convex — the opposite of concave.