concave: Meaning and Definition of

con•cave

1. curved like a segment of the interior of a circle or hollow sphere; hollow and curved. Cf. convex (def. 1).
2. (of a polygon) having at least one interior angle greater than 180°.
3. hollow.

1. a concave surface, part, line, or thing.
2. a concave piece, as one against which a drum rotates.

1. to make concave.