Source : Webster's Revised Unabridged Dictionary (1913)

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.] (Zo["o]l.)
   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.

Source : WordNet®

dormice
     See {dormouse}

dormouse
     n : small furry-tailed squirrel-like Old World rodent that
         becomes torpid in cold weather
     [also: {dormice} (pl)]