The Collaborative International Dictionary of English v.0.48:
Coypu \Coy"pu\ (koi"p??), n. [Native name.] (Zool.) A South American rodent (Myopotamus coypus), allied to the beaver. It produces a valuable fur called nutria. [Written also coypou.] [1913 Webster]WordNet (r) 3.0 (2006):
coypu n 1: aquatic South American rodent resembling a small beaver; bred for its fur [syn: coypu, nutria, Myocastor coypus]