powder down

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English

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Noun

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powder down (uncountable)

  1. A special type of down that occurs in a few groups of apparently unrelated birds. In some species, the tips of the barbules on the feathers disintegrate, forming fine particles of keratin; in others, powder grains come from cells that surround the barbules of growing feathers.
    All parrots have powder down.

See also

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