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Meaning Of Concave
a.
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.
a.
Hollow; void of contents.
n.
A hollow; an arched vault; a cavity; a recess.
n.
A curved sheath or breasting for a revolving cylinder or
roll.