control surface — English Dictionary

Noun

1. 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.

   Synonyms

   diving plane

   Narrower terms

   aileronelevatorrudder

   Examples

   Before flight, it is vital to ensure all control surfaces are clear of obstruction and can move smoothly and freely.

Noun

1. a device that provides reactive force when in motion relative to the surrounding air; can lift or control a plane in flight

   Synonyms

   airfoilaerofoilsurface

   Broader terms

   device