curved like a segment of the interior of a circle or hollow sphere; hollow and curved. Compare convex ( def. 1 ) .

Geometry . (of a polygon) having at least one interior angle greater than 180?.

Obsolete . hollow.

a concave surface, part, line, or thing.

Machinery . a concave piece, as one against which a drum rotates.

to make concave.

adjective

convex , distended

adjective

biconcave , cupped , dented , dimpled , dipped , excavated , hollow , hollowed , incurvate , incurvated , incurved , indented , round , rounded , sagging , scooped , sinking , sunkennotes:convex (from latin convexus \'arched , vaulted\') refers to a surface that curves outward , concave (from latin concavus \'hollow\') to a surface that curves inward , cavernous , sunken , arched , bowlike , depressed , dished , saddlebacked , vaulted