Webster's English Dictionary

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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