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bea·ver 1

a. Either of two large semiaquatic rodents, Castor canadensis of North America or C. fiber of Eurasia, having thick brown fur, webbed hind feet, a broad flat tail, and sharp incisors used for gnawing bark and felling trees, with which they construct dams and underwater lodges.
b. The fur of a beaver.
c. A top hat originally made of the underfur of a beaver.
2. A napped wool fabric, similar to felt, used for outer garments.
a. Vulgar Slang The female genitals.
b. Offensive Slang A woman or girl.
1. Of or relating to a beaver or beavers: beaver fur; a beaver hat.
2. Constructed by beavers: beaver dams.
intr.v. bea·vered, bea·ver·ing, bea·vers
To work diligently and energetically.

[Middle English bever, from Old English beofor; see bher- in Indo-European roots.]

bea·ver 2

or be·vor  (bē′vər)
1. A piece of armor attached to a helmet or breastplate to protect the throat or lower face.
2. The visor on a helmet.

[Middle English bavier, from Old French baviere, child's bib, beaver, from bave, saliva.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.