from the GNU version of the Collaborative International Dictionary of English

  • n. the peculiar dust, or exfoliation, of powder-down feathers.


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  • A type of down feather in which the tips of the plumules disintegrate into a fine, scaly powder that acts on the feathers to make them more waterproof. It's believed that powder down can also strengthen the barbs of the feathers, helping them to catch air more efficiently.

    August 27, 2008