羽う板ばん

noun

vane; web; vexillum

Ornithological term for the flat part of a feather, consisting of barbs and barbules.

• 鳥とりの羽う板ばんは、羽う軸じくから伸のびる枝えだのような構こう造ぞうでできている。

  The vane of a bird's feather is made up of branch-like structures extending from the shaft.