- A division of bivalve shells, like the marine mussels, in which the two adductor muscles are particularly unequal. See dreissena, and Illust. under byssus.
- a small grouping of acephalous conchiferous mollusks, including the Mytilidæ, or mussels and related types: distinguished from Dimyaria and Monomyaria.
Variant for "heteromyaria"
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