mussel

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mussel

(mŭs′əl)
n.
1. Any of various marine bivalve mollusks that attach to hard surfaces in intertidal areas with byssal threads, especially the edible members of the family Mytilidae and in particular Mytilus edulis, a blue-black species of the North Atlantic Ocean, raised commercially for food.
2. Any of numerous freshwater bivalve mollusks of the order Unionoida that burrow in the sand or mud of rivers, streams, and ponds.
3. Any of several similar bivalve mollusks, such as the zebra mussel.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

mussel

A bivalve mollusk belonging to the class Pelecypoda.
Medical Dictionary, © 2009 Farlex and Partners

mussel

the bivalve mollusc Mytilus edulis.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005