noun Aeronautics.
any surface, as a wing, aileron, or stabilizer, designed to aid in lifting or controlling an aircraft by making use of the air currents through which it moves.

1920–25; air1 + foil2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
aerofoil or (US and Canadian) airfoil (ˈɛərəʊˌfɔɪl, ˈɛəˌfɔɪl)
a cross section of an aileron, wing, tailplane, or rotor blade
airfoil or (US and Canadian) airfoil

airfoil (ˈɛəˌfɔɪl)
(US), (Canadian) Also called: aerofoil a cross section of an aileron, wing, tailplane, or rotor blade

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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American Heritage
Science Dictionary
airfoil   (âr'foil')  Pronunciation Key 
A structure having a shape that provides lift, propulsion, stability, or directional control in a flying object. An aircraft wing provides lift by causing air to pass at a higher speed over the wing than below it, resulting in greater pressure below than above. Propellers are airfoils that are spun rapidly to provide propulsion. See more at Bernoulli effect, See Note at aerodynamics.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
In fact, a sphere disrupts air flow, and has about ten times the drag resistance of a teardrop-shaped airfoil.
Not only can a coating of ice add significant weight to a plane, but it can also change the aerodynamics of the plane's airfoil.
Optical lift is different from the aerodynamic lift created by an airfoil.
Over an airfoil, the static pressure decreases up to the point of maximum thickness.
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