Fur is used in reference to the hair of animals, usually mammals, particularly those with extensive body hair coverage. The term "pelage" (French, from Middle French, from poil hair, from Old French peilss, from Latin pilus; first known use in English circa 1828.) is sometimes used to refer to the body hair of an animal as a complete coat. Fur is also used to refer to animal pelts which have been processed into leather with the hair still attached.