Source : Webster's Revised Unabridged Dictionary (1913)

Nutria \Nu"tri*a\, n. [Sp. nutria an otter, fr. L. lutra,
   lytra.]
   The fur of the coypu. See {Coypu}.

Source : WordNet®

nutria
     n : aquatic South American rodent resembling a small beaver;
         bred for its fur [syn: {coypu}, {Myocastor coypus}]