Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. One that kills: a disease that was a killer of thousands; a killer of new ideas.
  • n. Slang Something that is extremely difficult to deal with or withstand: an exam that was a real killer.
  • adj. Causing death or destruction: killer floods.
  • adj. Slang Having impressive or effective power or impact; formidable: had a killer smile; made killer profits.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. That which kills.
  • n. That which causes stress or is extremely difficult, especially that which may cause failure at a task.
  • n. Something that is so far ahead of its competition that it effectively kills off that competition.
  • n. A knockout form of darts involving several players.
  • n. A diacritic mark used in Indic scripts to suppress an inherent vowel (e.g., the Hindi viram, the Bengali or Oriya hasanta) or render the entire syllable silent (e.g., the Burmese virama, the Khmer toandakhiat).
  • adj. Excellent, very good.

from the GNU version of the Collaborative International Dictionary of English

  • n. One who deprives of life; one who, or that which, kills.
  • n. A voracious, toothed whale of the genus Orca, of which several species are known; called also killer whale.

from The Century Dictionary and Cyclopedia

  • n. One who kills or deprives of life; especially, a slaughterer; a butcher.
  • n. A club of hard wood, used for killing fish.—
  • n. A delphinid, Orca gladiator, and other species of that genus: so called from their ravenous and ferocious habits.
  • n. A contrivance for killing large ferocious animals.
  • n. The technical name among house-painters for anything used to prevent resin, locally present in woodwork, from exuding and making visible spots on the painted surface; also, in a more general sense, any substance used to remove spots on such surfaces.

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

  • n. predatory black-and-white toothed whale with large dorsal fin; common in cold seas
  • n. a difficulty that is hard to deal with
  • n. someone who causes the death of a person or animal
  • n. the causal agent resulting in death

Etymologies

to kill + -er. (Wiktionary)

Examples

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  • Sepak takraw jargon - a player whose task is to spike or kill the ball in the opponents' court.

    December 2, 2007