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concave British & World English

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

concavo-concave British & World English

Another term for biconcave.

convexo-concave British & World English

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

planoconcave British & World English

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