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concave US English

Having an outline or surface that curves inward like the interior of a circle or sphere

concave US Thesaurus

a small concave area now filled with rainwater

plano-concave US English

(Of a lens) with one surface plane and the opposite one concave

concavo-concave US English

Another term for biconcave.

convexo-concave US English

(Of a lens) convex on one side and concave on the other and thickest in the center