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control surface

noun
1.
any movable airfoil, as a rudder, flap, or aileron, for guiding or controlling an aircraft or missile in flight.
Origin
1915-1920
1915-20
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for control sur face

control surface

noun
1.
a movable surface, such as a rudder, elevator, aileron, etc, that controls an aircraft or rocket
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Value for control

9
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