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from the GNU version of the Collaborative International Dictionary of English

  • n. a genus of thin-shelled freshwater mussels.

from The Century Dictionary and Cyclopedia

  • n. A genus of asiphonate lamellibranchiate mollusks, or bivalves, of the family UnionidÅ“, in which the hinge-teeth are rudimentary or null.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. thin-shelled freshwater mussels


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