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Definitions

American Heritage® Dictionary of the English Language, Fourth Edition

  1. n. A hypothetical subatomic particle that always travels faster than the speed of light.

Wiktionary

  1. n. A hypothetical particle that travels faster than the speed of light.
  2. n. A flaw in a physical theory that predicts the existence of tachyons or similar paradoxical results. Compare with ghost.

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  • whichbe A generic name for hypothetical particles that travel faster than the speed of light and have an imaginary rest mass. (Wikipedia) May 23, 2008

‘tachyon’ has been looked up 995 times, loved by 1 person, added to 20 lists, commented on 1 time, and has a Scrabble score of 15.