Usually means: One who causes another's death.
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We found 39 dictionaries that define the word killer:

General (24 matching dictionaries)
  1. killer: Merriam-Webster.com
  2. killer: Oxford Learner's Dictionaries
  3. killer: American Heritage Dictionary of the English Language
  4. killer: Collins English Dictionary
  5. killer: Vocabulary.com
  6. Killer, killer: Wordnik
  7. killer: Cambridge Advanced Learner's Dictionary
  8. killer: Wiktionary
  9. killer: Webster's New World College Dictionary, 4th Ed.
  10. killer: Infoplease Dictionary
  11. Killer, killer: Dictionary.com
  12. killer: Cambridge Essential American English Dictionary
  13. KILLER, Killer (Adamski song), Killer (Alice Cooper album), Killer (Belgian band), Killer (Finnish band), Killer (Seal song), Killer (Swiss band), Killer (Tech N9ne album), Killer (album), Killer (atb), Killer (computer), Killer (disambiguation), Killer (game), Killer (philately), Killer (pool), Killer (video album), Killer (wrestler), Killer, The Killer (The Vampire Diaries), The Killer (comics), The Killer (play), The Killer: Wikipedia, the Free Encyclopedia
  14. Killer: Online Plain Text English Dictionary
  15. killer: Webster's Revised Unabridged, 1913 Edition
  16. killer: Rhymezone
  17. Killer: AllWords.com Multi-Lingual Dictionary
  18. killer: Free Dictionary
  19. killer: Mnemonic Dictionary
  20. killer: Dictionary/thesaurus
  21. killer: Wikimedia Commons US English Pronunciations
  22. killer: Webster's 1828 Dictionary

Art (1 matching dictionary)
  1. Glossary of Stamp Collecting Terms (No longer online)

Business (1 matching dictionary)
  1. Killer (band), The Killer, killer: Legal dictionary

Computing (1 matching dictionary)
  1. Killer (band), The Killer, killer: Encyclopedia

Medicine (2 matching dictionaries)
  1. online medical dictionary (No longer online)
  2. Killer (band), The Killer, killer: Medical dictionary

Miscellaneous (2 matching dictionaries)
  1. Brilliant Dream Dictionary (No longer online)
  2. killer: Idioms

Science (1 matching dictionary)
  1. KILLER: Cytokines & Cells Online Pathfinder Encyclopaedia

Slang (4 matching dictionaries)
  1. killer, killer: Green’s Dictionary of Slang
  2. Killer: Street Terms: Drugs and the Drug Trade
  3. killer: ESL Slang page
  4. the Killer: Urban Dictionary

Sports (1 matching dictionary)
  1. Racquetball Glossary (No longer online)

Tech (2 matching dictionaries)
  1. AUTOMOTIVE TERMS (No longer online)
  2. killer: Coin Collecting

(Note: See killers as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  One who or that which kills.
noun:  (figuratively) That which causes stress or is extremely difficult, especially that which may cause failure at a task.
noun:  (figuratively) Something that is so far ahead of its competition that it effectively kills off that competition.
noun:  (figuratively) A remarkably impressive person or thing.
noun:  (sports, uncountable) A knockout form of darts or pool involving several players.
noun:  A club used for killing fish.
noun:  (philately) A particularly heavy type of handstamp, or portion of one, often obscuring a large part of the postage stamp.
noun:  Synonym of virama (“kind of diacritical mark”)
adjective:  (slang) Excellent, very good, cool.
adjective:  Causing death, destruction, or obliteration.
adjective:  Distressing, uncomfortable.
noun:  Ellipsis of killer whale. [A sea mammal related to dolphins and porpoises (Orcinus orca).]

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