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From The Collaborative International Dictionary of English v.0.48:
Dormouse \Dor"mouse\, n.; pl. Dormice. [Perh. fr. F. dormir to sleep (Prov. E. dorm to doze) + E. mouse; or perh. changed fr. F. dormeuse, fem., a sleeper, though not found in the sense of a dormouse.] (Zool.) A small European rodent of the genus Myoxus, of several species. They live in trees and feed on nuts, acorns, etc.; -- so called because they are usually torpid in winter. [1913 Webster]