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concave

Source : Webster's Revised Unabridged Dictionary (1913)

Concave \Con"cave\ (k[o^][ng]*k[=a]*v" or k[o^]n"-; 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.

Concave \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.

Concave \Con"cave\, v. t. [imp. & p. p. {concaved}; p. pr. & vb.
   n. {Concaving}.]
   To make hollow or concave.

Source : WordNet®

concave
     adj : curving inward [ant: {convex}]
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