ailerons

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
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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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