Heteromyaria \Het`e*ro*my*a"ri*a\, n. pl. [NL., fr. Gr. ? other
+ ? a muscle.] (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}.
[1913 Webster]