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. [R.] As concave . . . as a worm-eaten nut. Shak.
A hollow; an arched vault; a cavity; a recess. Up to the fiery concave towering hight. Milton.
A curved sheath or breasting for a revolving cylinder or roll.
To make hollow or concave.
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