Dictionary![]() ![]() pla•no-con•cavePronunciation: (plā"nō-kon'kāv, -kon-kāv'), [key] —adj. Optics. pertaining to or noting a lens that is plane on one side and concave on the other. See diag. under lens. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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