control surf ace

control surface

noun
any movable airfoil, as a rudder, flap, or aileron, for guiding or controlling an aircraft or missile in flight.

Origin:
1915–20

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
control surface
 
n
a movable surface, such as a rudder, elevator, aileron, etc, that controls an aircraft or rocket

Collins English Dictionary - Complete & Unabridged 10th Edition
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