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From The Collaborative International Dictionary of English v.0.48:
Muskrat \Musk"rat`\, n. 1. (Zool.) A North American aquatic fur-bearing rodent (Ondatra zibethica formerly 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, ondatra, and sometimes water rat. [1913 Webster +PJC] 2. (Zool.) The musk shrew. [1913 Webster] 3. (Zool.) The desman. [1913 Webster]