fur noun (HAIR) the thick hair that covers the bodies of some animals, or the hair-covered skin(s) of animals, removed from their bodies: She stroked the rabbit's soft fur. fake fur "Is that real fur on your collar?" "Certainly not - I only wear fake fur." fur coat She was wearing a fur coat and black leather boots.

: a piece of the dressed pelt of an animal used to make, trim, or line wearing apparel. 2. : an article of clothing made of or with fur. 3. : the hairy coat of a mammal especially when fine, soft, and thick.

Fur is a thick growth of hair that covers the skin of almost all mammals. It consists of a combination of oily guard hair on top and thick underfur beneath. The guard hair keeps moisture from reaching the skin; the underfur acts as an insulating blanket that keeps the animal warm.

Hair is an umbrella term for a range of essentially similar structures – fur, wool, whiskers, bristles and lashes – growing from the skin of mammals. That said, fur is widely understood to be the particularly thick hair that covers much of the body.