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tachyon

[tak-ee-on]
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noun Physics.
  1. a hypothetical particle that travels faster than the speed of light.
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Origin of tachyon

First recorded in 1967; tachy- + -on1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for tachyon

tachyon

noun
  1. physics a hypothetical elementary particle capable of travelling faster than the velocity of light
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Word Origin

C20: from tachy- + -on
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for tachyon

n.

1967, hypothetical faster-than-light particle, from tachy- "swift" + -on.

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Online Etymology Dictionary, © 2010 Douglas Harper

tachyon in Science

tachyon

[tăkē-ŏn′]
  1. A hypothetical subatomic particle that travels faster than the speed of light. Although the principles of relativity forbid the acceleration of a particle past the speed of light, they do not prohibit the existence of particles that have always moved faster than that speed. No such particle has ever been detected.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.