| Concave 1. (a.) Hollow and curved or rounded inward; in opposition to convex; as, a concave mirror; the concave arch of the sky. 2. (a.) Hollow; void of contents. 3. (n.) A hollow; an arched vault; a cavity; a recess. 4. (n.) A curved sheath or breasting for a revolving cylinder or roll. 5. (v. t.) To make hollow or concave. Thesaurus Entries 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 |