翮かく

noun

quill; calamus

Ornithological term for the hollow shaft of a feather. Rare in everyday language; mainly encountered in scientific or literary descriptions of birds.

• 鳥とりの羽はねの翮かくは中ちゅう空くうで軽かるい。

  The quill of a bird's feather is hollow and light.

• この標ひょう本ほんでは翮かく