conchal

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con·cha

C0547100 (kŏng′kə)n. pl. con·chae (-kē′) 1. Anatomy Any of various structures, such as the external ear, that resemble a shell in shape. Also called conch.2. Architecture The half dome over an apse.
[Late Latin, semidome, from Latin, mussel shell; see conch.]
con′chal (-kəl) adj.