Wing: A device for catching the form of lightness known as air. When a creature makes use of this buoyant force, it is said to be taking wing, or taking to the air. Once a creature has taken wing (or taken to the air) it is said to be riding the wind. Wind and wing: one  an ever-present but hidden force of buoyancy; the other the means of catching it.

Gulls soar on their broad wings.

Maple seeds use their wings to turn a vertical fall into a lateral motion.