the entire feathery covering of a bird.
feathers collectively.

1375–1425; late Middle English < Middle French. See plume, -age

plumaged, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
plumage (ˈpluːmɪdʒ)
the layer of feathers covering the body of a bird
[C15: from Old French, from plume feather, from Latin plūma down]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1481, "feathers," from O.Fr. plumage (14c.), from plume (see plume).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
plumage   (pl'mĭj)  Pronunciation Key 
The covering of feathers on a bird.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica


collective feathered covering of a bird. It provides protection, insulation, and adornment and also helps streamline and soften body contours, reducing friction in air and water. Plumage of the newborn chick is downy, called neossoptile; that which follows is termed teleoptile. Juvenal plumage, frequently distinct from that of the adult bird, is often drab, streaked, or spotted and thus camouflages the young

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Various vultures have featherless necks, presumably to stop the blood and gore
  from their meals matting their plumage.
Hummingbirds have long been admired for their colorful and iridescent plumage.
They even have colors in their plumage that are invisible to the human eye.
They had little reason to think otherwise, since every swan ever examined had
  the same snowy plumage.
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