Definition of: sewellel

(si·wel′el) noun
A brown, burrowing, nocturnal, vegetarian rodent (Aplodontia rufa) of the Pacific coast north of California; the mountain beaver. [<Chinook shewallal dual, a blanket of two sewellel skins sewn together (mistaken by Lewis and Clark for the animal's name) <ogwoolal a sewellel]