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