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control surface

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

First recorded in 1915–20
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for control surface

control surface

noun
  1. a movable surface, such as a rudder, elevator, aileron, etc, that controls an aircraft or rocket
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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