Real Dictionary

feather
countable noun: A bird's feathers are the soft covering on its body. Each feather consists of a lot of smooth hairs on each side of a thin stiff centre.

feather in American English
any of the growths covering the body of a bird or making up a large part of the wing surface, as down or contour feathers: a typical contour feather consists of a horny central shaft, partly hollow, from which light, soft, narrow barbs, with interlocking
intransitive verb: to grow feathers
noun: one of the horny structures forming the principal covering of birds, consisting typically of a hard, tubular portion attached to the body and tapering into a thinner, stemlike portion bearing a series of slender, barbed processes that interlock to form a
transitive verb: to provide with feathers, as an arrow

feather in British English
noun: any of the flat light waterproof epidermal structures forming the plumage of birds, each consisting of a hollow shaft having a vane of barbs on either side. They are essential for flight and help maintain body temperature
verb: to fit, cover, or supply with feathers