A small plane or surface capable of being manipulated by the pilot of a flying machine to control lateral balance; a hinged wing tip; a lateral stabilizing or balancing plane.
A hinged or movable portion of an airplanes wing, at the trailing edge, primarily used to induce roll.
A control surface for controlling roll or bank. There is one aileron on each wing, and they move in opposite directions. They are controlled by turning the control yoke, like a car's steering wheel.