GNU Collaborative International Dictionary of English

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1.       
   ‖Concha , n. [LL. (in sense 1), fr. L. concha. See Conch.]
   (Arch.) The plain semidome of an apse; sometimes used for the entire apse.
   1913 Webster
   (Anat.) The external ear; esp. the largest and deepest concavity of the external ear, surrounding the entrance to the auditory canal.
   1913 Webster