Bulky nocturnal burrowing rodent of uplands of the Pacific coast of North America

• The most primitive living rodent

Wiktionary Word definitions in Wiktionary
n. The mountain beaver (''Aplodontia rufa'').

WordNet Word definitions in WordNet
n. bulky nocturnal burrowing rodent of uplands of the Pacific coast of North America; the most primitive living rodent [syn: mountain beaver , Aplodontia rufa ]

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Sewellel \Se*wel"lel\, n. [Of American Indian origin.] (Zo["o]l.) A peculiar gregarious burrowing rodent ( Haplodon rufus ), native of the coast region of the Northwestern United States. It somewhat resembles a muskrat or marmot, but has only a rudimentary ...