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 Unionidœ, 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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