Akademik

concavity
A hollow or depression, with more or less evenly curved sides, on any surface.

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con·cav·i·ty kän-'kav-ət-ē n, pl -ties
1) a concave surface or space
2) the quality or state of being concave

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con·cav·i·ty (kon-kavґĭ-te) [con- + cavity] a hollowed-out area on the surface of an organ or other structure.

Medical dictionary. 2011.