Con"cave [L. concavus; con- + cavus hollow: cf. F. concave. See Cave a hollow.]
1.
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.
2.
Hollow; void of contents.
[R.]
As concave . . . as a worm-eaten nut.
Shak.
© Webster 1913.
Con"cave, n. [L. concavum.]
1.
A hollow; an arched vault; a cavity; a recess.
Up to the fiery concave towering hight.
Milton.
2. Mech.
A curved sheath or breasting for a revolving cylinder or roll.
© Webster 1913.
Con"cave, v. t. [imp. & p. p. concaved (); p. pr.& vb. n. Concaving.]
To make hollow or concave.
© Webster 1913.