coypu(redirected from Neutral rat)
Also found in: Dictionary, Thesaurus, Encyclopedia.
Related to Neutral rat: Coypou
a large chestnut brown, 14 inch long and 15 lb in weight, aquatic rodent which is farmed extensively for its fur. It is herbivorous, diurnal and very fertile. As a wild animal in countries where it has escaped, it has become a pest. Called also nutria, Myocastor coypus, swamp beaver.