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(kkv" or kn"-; 277), a.[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. 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. Con"cave v. t.[imp. & p. p.concaved (); p. pr. & vb. n.Concaving.] To make hollow or concave. スポンサード リンク
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