Definitions

from the GNU version of the Collaborative International Dictionary of English

  • proper n. A genus of bivalve shells of which one species (Dreissena polymorpha) is often so abundant as to be very troublesome in the fresh waters of Europe.

from The Century Dictionary and Cyclopedia

  • n. A genus of bivalve lamellibranchs, of the family Mytilidœ, or mussels, or made type of the family Dreissenidœ.

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

  • n. zebra mussels

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