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muskrat (n.)

also musk-rat, "large aquatic rodent of North America," 1610s, alteration (by association with musk and rat) of an Algonquian word (probably Powhatan), muscascus, literally "it is red," so called for its coloring. From cognate Abenaki moskwas comes variant form musquash (1620s). Dialectal mushrat is by 1890.

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Definitions of muskrat

muskrat (n.)
the brown fur of a muskrat;
Synonyms: muskrat fur
muskrat (n.)
beaver-like aquatic rodent of North America with dark glossy brown fur;
Synonyms: musquash / Ondatra zibethica
From wordnet.princeton.edu