SEWELLEL

noun 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 tail. its head is broad, its eyes are small and its fur is brownish above, gray beneath. it constitutes the family haplodontidae. called also boomer, showt'l, and mountain beaver.