control surface ( synonym found)
Definition of control surface:

(n) : a moveable surface attached to a machine such as an aircraft or submarine that can be used to control the machine's motion in roll, pitch or yaw
"before flight its is vital to ensure all control surfaces are clear of obstruction and can move smoothly and freely."
Definition of control surface:

(n) : a moveable surface attached to a machine such as an aircraft or submarine that can be used to control the machine's motion in roll, pitch or yaw
"before flight its is vital to ensure all control surfaces are clear of obstruction and can move smoothly and freely."
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