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AOL: These Enchanting Unicorn Halloween Costumes Will Bring the Magic to Life Here are the cold, hard facts about 10 of history’s most infamous serial killers. KILLER definition: a person or thing that kills. See examples of killer used in a sentence. A killer is a person who has killed someone, or who intends to kill someone. The police are searching for his killers. He's a psychopath, a killer. Definition of killer noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

1. a person or thing that kills. 2. Slang. something or someone having a formidable impact, devastating effect, etc. 3. severe; powerful: a killer cold. 4. very difficult or demanding: a killer chess tournament. 5. very effective; superior: a killer recipe for fried chicken. killer, n. meanings, etymology, pronunciation and more in the Oxford English Dictionary