Concave
From BiblePortal Wikipedia
Concave [1]
(1): (a.) Hollow; void of contents.
(2): (v. t.) To make hollow or concave.
(3): (n.) A curved sheath or breasting for a revolving cylinder or roll.
(4): (n.) A hollow; an arched vault; a cavity; a recess.
(5): (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.
