noun
also coy·pou ˈkȯi(ˌ)pü, ̷ ̷ˈ ̷ ̷
( -s )
Etymology: American Spanish coipú, from Araucan coypu
1. : a So. American aquatic rodent ( Myocastor coypus ) with webbed feet and dorsally located mammae that has been introduced into other regions for the sake of its fur and is now thoroughly naturalized on the United States Gulf Coast and Pacific Northwest and is a pest in parts of England because of its destruction of marsh vegetation
2. : nutria 1b