Feather (English spelling)

Japanese: 羽∥羽根 - はね（英語表記）feather

Generally, it is also used to refer to the feathers of an arrow or the wings of an airplane, but in zoology, it refers to feathers. Feathers are a modified cuticle unique to birds, covering the surface of the bird's body and forming the flight and tail feathers. The main functions of feathers are to maintain body temperature and to fly, but they also serve to protect the skin, display, and identify species. There are various types of feathers, including full feathers, down feathers, semi-down feathers, thread-like feathers, and powder feathers. Full feathers are used for flight and to protect the skin, while down feathers and semi-down feathers help maintain body temperature.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

一般には矢羽根や飛行機の翼のことをもいうが，動物学的には羽毛のこと。羽毛は鳥類特有の表皮の変形物で，鳥の体の表面をおおい，また風切羽および尾羽となっている。羽毛の主な機能は体温の保持と飛翔（ひしよう）のためであるが，そのほか皮膚の保護，ディスプレーや種の認識などのためにも役だつ。羽毛には正羽，綿羽，半綿羽，糸状羽，粉綿羽などの種類があり，飛翔と皮膚の保護にあたるのは正羽で，綿羽と半綿羽は体温の保持に役だつ。

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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