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Entry 5 senses · 3 variants Webster, 1913

Concave

/(kŏṉ*kā*v" [or] kŏn"-; 277)/ · Con·cave · IPA /ˈkɑn.keɪv/
01 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 …
  1. 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. 2.
    Hollow; void of contents.[R.]
    “As concave . . . as a worm-eaten nut.” — Shak.
02 n. A hollow; an arched vault; a cavity; a recess.
  1. 1.
    A hollow; an arched vault; a cavity; a recess.
    “Up to the fiery concave towering hight.” — Milton.
  2. 2.
    A curved sheath or breasting for a revolving cylinder or roll.(Mech.)
03 v. t. To make hollow or concave.
imp. & p. p. concaved; p. pr. & vb. n. Concaving
  1. 1.
    To make hollow or concave.