down

Japanese: down
down

…Most of the feathers covering the body surface, as well as the flight feathers and tail feathers, are normal feathers, whose main function is to protect the skin and to fly. Down feathers are fluffy, cotton-like feathers that do not have a distinct shaft and differ from normal feathers in that the barbs do not have hooks. Down feathers are located underneath the normal feathers and help maintain body heat, and are particularly well developed in waterfowl such as ducks. …

*Some of the terminology that mentions "down" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…体表面をおおう羽毛の大部分と風切羽(かざきりばね)および尾羽はみな正羽で,その機能は主として皮膚の保護と飛行である。綿羽downはふわふわした綿のような羽毛で,はっきりした羽軸をもたず,また羽小枝に鉤がない点で正羽と異なる。綿羽は正羽の下にあって,体温を保持するのに役立ち,カモ類などの水鳥でとくによく発達している。…

※「down」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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