01n. pl.
A division of bivalve shells, including the marine mussels, in which the two adductor muscles are very unequal. See Dreissena, and Illust. …
1.
A division of bivalve shells, including the marine mussels, in which the two adductor muscles are very unequal. See Dreissena, and Illust. under Byssus.(Zool.)See: Dreissena, Byssus