One of a pair of movable organs for flying,as the feather-covered modified forelimb of a bird or the skin-covered modified digits of the forelimb of a bat.

• 翅膀，翼用于飞行的一对可移动器官，如鸟的羽毛覆盖的改进的前肢或蝙蝠的皮毛覆盖的改进的前肢脚趾。