- Hollow and curved or rounded; vaulted; -- said of the
interior of a curved surface or line, as of the curve of the of the
inner surface of an eggshell, in opposition to convex; as, a concave
mirror; the concave arch of the sky. - Hollow; void of contents.
2 . Concave
[ n.]
- A hollow; an arched vault; a cavity; a recess. - A curved sheath or breasting for a revolving cylinder or
roll.