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From The Collaborative International Dictionary of English v.0.44 [gcide]:
Concave \Con"cave\ (k[o^][ng]*k[=a]*v" or k[o^]n"-; 277), adjective [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.
From The Collaborative International Dictionary of English v.0.44 [gcide]:
Concave \Con"cave\, noun [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.
From The Collaborative International Dictionary of English v.0.44 [gcide]:
Concave \Con"cave\, verb (used with an object) [imp. & p. p. {concaved}; p. pr. & vb. n. {Concaving}.] To make hollow or concave.
From WordNet (r) 2.0 [wn]:
concave
adjective: curving inward [ant: {convex}]
From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]:
53 Moby Thesaurus words for "concave": arched, arciform, arclike, arcual, bandy, boat-shaped, boatlike, bowed, bowl-shaped, bowlike, bowllike, cavelike, cavernous, concaved, convex, craterlike, cup-shaped, cupped, cymbiform, dish-shaped, dished, dishing, dishlike, embowed, funnel-breasted, funnel-chested, funnel-shaped, gibbose, gibbous, hollow, hollowed, humpbacked, humped, humpy, hunched, hunchy, incurved, incurving, incurvous, infundibular, infundibuliform, navicular, naviform, oxbow, retiring, retreating, saucer-shaped, scaphoid, scyphate, spoonlike, sunk, sunken, vaulted
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