spoiler

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun One that spoils, especially.
• noun A candidate for office whose chances of winning are slight but who may get enough votes to prevent one of the leading candidates from winning.
• noun Sports A competitor that has no chance of winning or qualifying (as for a playoff) but defeats and thereby prevents another from doing so.
• noun A published piece of information that divulges a surprise, such as a plot twist in a movie.
• noun One who seizes spoils or booty.
• noun A long, narrow hinged plate on the upper surface of an airplane wing that reduces lift and increases drag when raised.
• noun An air deflector mounted usually at the rear of an automobile to reduce lift at high speeds.

from The Century Dictionary.

• noun One who or that which spoils.
• noun One who or that which impairs, mars, or decays.

from the GNU version of the Collaborative International Dictionary of English.

• noun One who spoils; a plunderer; a pillager; a robber; a despoiler.
• noun One who corrupts, mars, or renders useless.
• noun (Aeronautics) 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.
• noun 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}.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun One who spoils; a plunderer; a pillager; a robber; a despoiler.
• noun One who corrupts, mars, or renders useless.
• noun A document, review or comment that discloses the ending or some key surprise, or twist in a story.
• noun aeronautics A device to reduce lift.
• noun automotive A device to reduce lift and increase downforce
• noun US, sports An individual (or organisation etc.), unable to win themselves, who spoils the chances of another's victory.
• noun trading card games A comprehensive list of objects and their characteristics.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a candidate with no chance of winning but who may draw enough votes to prevent one of the leading candidates from winning
• noun a hinged airfoil on the upper surface of an aircraft wing that is raised to reduce lift and increase drag
• noun someone who pampers or spoils by excessive indulgence
• noun someone who takes spoils or plunder (as in war)
• noun an airfoil mounted on the rear of a car to reduce lift at high speeds