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