Webster's English Dictionary

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concha

con.cha \'ka:n-k*\ \-.ke-, -.ki-\ \-k*l\ n or con.chae [It & L; It conca 
   semidome, apse, fr. LL concha, fr. L, shell] pl  1: the plain semidome of 
   an apse; sometimes : APSE  2: something shaped like a shell; esp : the 
   largest and deepest con cavity of the external ear - con.chal aj