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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Example sentences
The all-moving control surface, found on high-speed aircraft, operates
  differently and is more effective.
For this method a control surface is defined at the exit of the nozzle.
Control surface hinge moments and wing loads were constrained to remain within
  hydraulic and load limits.
Deflection of an aileron control surface when flying at high dynamic pressure
  has two effects.
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