Definition of "airfoil" []

• A part or surface, such as a wing, propeller blade, or rudder, whose shape and orientation control stability, direction, lift, thrust, or propulsion. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Feduccia (1993, p. 162) stated that ‘there can be no doubt that an airfoil is produced by the sifaka’s arms and the partial incorporation of a “lift mechanism” would advantageously augment the horizontal extent of a “leap”’."
• "The cross-sectional shape of the wing, from a side-view, is referred to as the airfoil section."
• "It is 15 miles per hour faster than a Piper Cub due to using a NACA developed airfoil."