con·cave (k n-k v , knkv )adj. Curved like the inner surface of a sphere. n. A concave surface, structure, or line. tr.v. con·caved, con·cav·ing, con·caves To make concave. [Middle English, from Latin concavus : com-, intensive pref.; see com- + cavus, hollow; see keu  - in Indo-European roots.]con·cave ly adv.con·cave ness n. |   left to right: biconcave, plano-concave, and concavo-convex lenses |
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