an amphibious rodent, of the genus castor.-the fur of the beaver.-a hat, formerly made of the fur of the beaver, but now usually of silk.-beaver cloth, a heavy felted woolen cloth, used chiefly for making overcoats.-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.