beaver
1. bea.ver \'be--v*r\ n or beavers; or beaver [ME bever, fr. OE beofor; akin to OHG bibar beaver, OE bru] pl -n brown pl 1a: either of two large semiaquatic rodents (genus Castor) with webbe d hind feet and a broad flat tail that construct dams and underwater lodges and yield valuable fur and castor 1b: the fur or pelt of the beaver 2a: a hat made of beaver fur or a fabric imitation 2b: SILK HAT 3: a heavy fabric of felted wood or of cotton napped on both sides 2. beaver n [ME baviere, fr. MF] 1: a piece of armor protecting the lower part of the face 2: a helmet visor
Webster's English Dictionary