Airfoil

n. surface (as in a wing, propeller, etc.) designed to aid in lifting and controlling an aircraft by means of air currents (Aeronautics)

An airfoil (in American English, or aerofoil in British English) is the shape of a wing or blade (of a propeller, rotor or turbine) or sail as seen in cross-section. An airfoil shaped body moved through a fluid produces a force perpendicular to the motion called lift.  Subsonic flight airfoils have a characteristic shape with a rounded leading edge, followed by a sharp trailing edge, often with asymmetric camber. Airfoils designed with water as the working fluid are also called hydrofoils.
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Noun
1. a device that provides reactive force when in motion relative to the surrounding air; can lift or control a plane in flight
(synonym) aerofoil, control surface, surface
(hypernym) device
(hyponym) aileron
(part-meronym) leading edge

airfoil /'eərou,fɔil/ (airfoil) /'eəfɔil/
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