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Powder-down feather


  • Webster's Revised Unabridged Dictionary
    • Powder-down feather (Zoöl) one of a peculiar kind of modified feathers which sometimes form patches on certain parts of some birds. They have a greasy texture and a scaly exfoliation.
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In literature:

Powder-down feathers are degenerate down-feathers which appear to secrete a dry, waxy kind of powder.
"Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 2" by Various
There are flight feathers, clothing feathers, downy feathers, thread feathers, and powder-down feathers.
"The Children's Book of Birds" by Olive Thorne Miller