Feather n. : One of the peculiar dermal appendages, of several kinds, belonging to birds, as contour feathers, quills, and down.

Feather n. : Kind; nature; species; -- from the proverbial phrase, "Birds of a feather," that is, of the same species.

Feather n. : The fringe of long hair on the legs of the setter and some other dogs.

Feather n. : A tuft of peculiar, long, frizzly hair on a horse.

Feather n. : One of the fins or wings on the shaft of an arrow.

Feather n. : A longitudinal strip projecting as a fin from an object, to strengthen it, or to enter a channel in another object and thereby prevent displacement sidwise but permit motion lengthwise; a spline.

Feather n. : A thin wedge driven between the two semicylindrical parts of a divided plug in a hole bored in a stone, to rend the stone.

Feather n. : The angular adjustment of an oar or paddle-wheel float, with reference to a horizontal axis, as it leaves or enters the water.

Feather v. t. : To furnish with a feather or feathers, as an arrow or a cap.

Feather v. t. : To adorn, as with feathers; to fringe.

Feather v. t. : To render light as a feather; to give wings to.

Feather v. t. : To enrich; to exalt; to benefit.

Feather v. t. : To tread, as a cock.

Feather v. i. : To grow or form feathers; to become feathered; -- often with out; as, the birds are feathering out.

Feather v. i. : To curdle when poured into another liquid, and float about in little flakes or "feathers;" as, the cream feathers

Feather v. i. : To turn to a horizontal plane; -- said of oars.

Feather v. i. : To have the appearance of a feather or of feathers; to be or to appear in feathery form.

Example:
My Feather filled couch keeps losing its Feathers, how do I stop them all coming out?

Taxonomy
feathers, birds, keratin, pigments, plumage, flight, coloration, contour feathers, species, lice, tracts, bristles, melanin, down feathers, tail feathers, flight feathers, carotenoid, rachis.

Defination from the web:
feather features a main shaft, called the rachis. ... At the base of the feather, the rachis expands to form the hollow tubular calamus (or quill) which inserts into a follicle in the skin. ... A contour feather from a Guinea fowl. ...