noun Physics.
a hypothetical particle that travels faster than the speed of light.

1967; tachy- + -on1

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World English Dictionary
tachyon (ˈtækɪˌɒn)
physics a hypothetical elementary particle capable of travelling faster than the velocity of light
[C20: from tachy- + -on]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1967, hypothetical faster-than-light particle, from Gk. tachys "swift."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
tachyon   (tāk'ē-ŏn')  Pronunciation Key 
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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Thus, time and space is both traversed instantaneously as the illusive tachyon particle.
Furthermore, it was an open question whether cancellation of the tachyon survives past one loop.
Tachyon was requested to withdraw this application by email but has failed to do so.
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