From The Collaborative International Dictionary of English v.0.48:

Plumage \Plum"age\ (pl[=u]m"[asl]j), n. [F., from plume a
   feather.] (Zool.)
   The entire clothing of a bird.
   [1913 Webster]

   Note: It consist of the contour feathers, or the ordinary
         feathers covering the head, neck, and body; the tail
         feathers, with their upper and lower coverts; the wing
         feathers, including primaries, secondaries, and
         tertiaries, with their coverts; and the down which lies
         beneath the contour feathers. See Illust. under Bird.
         [1913 Webster]
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