1. a hat made of beaver pelt. The styles varied by culture - so could be a top hat, tricorne, bicorne, or something other
2. the face guard of a suit of armour
► uses
Uses:
A mass of rags covered his shoulders, and an old staved-in beaver, turned out like a basin, hid his face;
Gustave Flaubert. Madame Bovary
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there ‘lighted from a handsome black pony a very dignified person, with brown ringlets falling from the cover of a feathered beaver, and a long cloth habit, which she was obliged to hold up with both hands that she might sail in.
Emily Brontë. Wuthering Heights (1847)
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The man wore a tall beaver hat and a long frock coat.
Larry McMurtry. Lonesome Dove (1985)
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Two Knights habited in complete armour, their beavers down, comrades to the principal Knight.