- a part with a flat or curved surface, as a wing, rudder, etc., specifically designed to keep an aircraft up or control its movements by reacting to the air through which it moves
- a similar winglike surface designed to improve stability for high-speed cars and boats; spoiler
See airfoil in American Heritage Dictionary 4
A part or surface, such as a wing, propeller blade, or rudder, whose shape and orientation control stability, direction, lift, thrust, or propulsion.
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