[nu.tria] n [AmerSp, fr. Sp, otter, modif. of L lutra; prob. akin to OE oter otter] (1820) 1: the durable usu. light brown fur of a nutria
2: a large So. American semiaquatic rodent (Myocastor coypus) with webbed hind feet that has been introduced into parts of Europe, Asia, and No. America