Last Updated：2025/11/29
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.
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powder down
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Source Word
powder down
Noun
uncountable
Japanese Meaning
鳥類の一部の群れで見られる特殊な粉状ダウン。羽毛の細い毛羽（バーブール）の先端が分解して極細のケラチン粒子となるか、成長中の羽毛を取り囲む細胞から粉粒が生じる現象による羽毛の一部である
