(1):
(n.) The fur of the beaver.
(2):
(n.) Beaver cloth, a heavy felted woolen cloth, used chiefly for making overcoats.
(3):
(n.) That piece of armor which protected the lower part of the face, whether forming a part of the helmet or fixed to the breastplate. It was so constructed (with joints or otherwise) that the wearer could raise or lower it to eat and drink.
(4):
(n.) An amphibious rodent, of the genus Castor.
(5):
(n.) A hat, formerly made of the fur of the beaver, but now usually of silk.