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from the GNU version of the Collaborative International Dictionary of English

  • A division of bivalve shells, including the marine mussels, in which the two adductor muscles are very unequal. See dreissena, and Illust. under byssus.

from The Century Dictionary and Cyclopedia

  • A group of acephalous conchiferous mollusks, including the Mytilid√¶, or mussels and related forms: distinguished from Dimyaria and Monomyaria.


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