Spoiler /(spoil"ẽr)/

Spoil·er

Spoiler

n.
  1. One who spoils; a plunderer; a pillager; a robber; a despoiler.
  2. One who corrupts, mars, or renders useless.
  3. A device attached to the wing of an airplane or other airfoil, which breaks the smooth flow of air during flight and decreases the lift of the airfoil; -- used to control the attitude of the airplane during banking or descent. (Aeronautics)
  4. A device attached to a car to decrease lift and increase traction, usually shaped as a flat surface and attached above the rear of the car, and working on the same principal as the aircraft spoiler{3}.