Heteromyaria

Het`e`ro`my`a´ri`a


n. pl.1.(Zool.) A division of bivalve shells, including the marine mussels, in which the two adductor muscles are very unequal. See Dreissena, and Illust. under Byssus.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.