What is the meaning of beaver?

noun

• The soft brown fur of the beaver.
  • synonyms: beaver fur
• A native or resident of Oregon.
  • synonyms: Oregonian
• A full beard.
• A man's hat with a tall crown; usually covered with silk or with beaver fur.
  • synonyms: dress hat, high hat, opera hat, silk hat, stovepipe, top hat, topper
• A movable piece of armor on a medieval helmet used to protect the lower face.
• A hat made with the fur of a beaver (or similar material.
  • synonyms: castor
• Large semiaquatic rodent with webbed hind feet and a broad flat tail; construct complex dams and underwater lodges.

verb

• Work hard on something.
  • synonyms: beaver away