羽う弁べん

noun

vane; web (of a feather)

Ornithological term for the flat part of a feather, consisting of barbs extending from the rachis.

• 鳥とりの羽う弁べんは、羽う軸じくから伸のびる枝えだによって形けい成せいされる。

  The vane of a bird's feather is formed by barbs extending from the rachis.