powder down

English

powder down (uncountable)

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.

单词	powder down
释义	powder down English Noun powder down (uncountable) 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. See also pulviplume
随便看	diklantas diklap diklat diklatjemen diklem diklippig diklofenaakki diklom dikloorimetaani dikmaals dikmeg dikmek dikmək diko dikobraz dikoje dikojim dikojin dikojî dikojîne dikojînim dikojînin dikojînî di kon dikoor