English Dictionary

powder down

名詞

不可算名詞

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.

日本語の意味

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

The zookeeper explained that the parrots' powder down produces a fine dust that can irritate the lungs if inhaled.

飼育員は、オウムの粉状羽毛が微細な角質の粒子を生じ、吸い込むと肺を刺激することがあると説明した。

意味（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.