concave

CONCAVE, a. [L. Hollow. See Cave.]

1. Hollow, and arched or rounded, as the inner surface of a spherical body; opposed to convex; as a concave glass.

2. Hollow, in a general sense; as the concave shores of the Tiber.

3. In botany, a concave leaf is one whose edge stands above the disk.

CONCAVE, n. A hollow; an arch, or vault; as the ethereal concave.

CONCAVE, v.t. To make hollow.