A North American aquatic fur-bearing rodent (Fiber zibethicus). It resembles a rat in color and having a long scaly tail, but the tail is compressed, the hind feet are webbed, and the ears are concealed in the fur. It has scent glands which secrete a substance having a strong odor of musk. Called also musquash, musk beaver, and ondatra.
- A large aquatic rodent (Ondatra zibethica) of North America, related to the lemming and the vole and having a dense brown coat and musk glands under a broad flat tail. Also called musquash, water rat.
- The fur of this rodent.