Powder-down feather

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Related to Powder-down feather: flight feather, Contour feathers
(Zool.) 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.

See also: Powder

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.