aileron

[ey-luh-ron]
noun
1.
Aeronautics. a movable surface, usually near the trailing edge of a wing, that controls the roll of the airframe or effects maneuvers, as banks and the like.
2.
a wall at the end of a roof with a single slope, as that of a church aisle.

Origin:
1905–10; < French, equivalent to ail(e) (see aisle) + -eron diminutive suffix

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
aileron (ˈeɪlərɒn)
 
n
a flap hinged to the trailing edge of an aircraft wing to provide lateral control, as in a bank or roll
 
[C20: from French, diminutive of aile wing]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

aileron
1909, from Fr. aileron, altered (by influence of aile "wing"), from Fr. aleron "little wing," dim. of O.Fr. ele "wing" (12c.), from L. ala "wing."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
aileron   (ā'lə-rŏn')  Pronunciation Key 
A hinged surface that is part of the back edge of each wing on an airplane. The ailerons are moved up or down to create uneven lift on the sides of the plane to control its rolling and tilting movements.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

aileron

movable part of an airplane wing that is controlled by the pilot and permits him to roll the aircraft around its longitudinal axis. Ailerons are thus used primarily to bank the aircraft for turning. Ailerons have taken different forms through the years but are usually part of the wing's trailing edge, near the tip. Their efficiency in lateral control made obsolete the Wright brothers' system of wing warping.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
One aileron is found at the outer trailing edge of each wing.
The hinged part found on the trailing edge of the wing is called the aileron.
The left aileron cables were found attached to the aileron sector, which was
  damaged with the stops in place.
Aileron and rudder responses are shown along with the pilot rudder doublet
  inputs.
Image for aileron
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