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tachyon

   Also found in: Encyclopedia, Wikipedia 0.01 sec.
tach·y·on  (tk-n)
n.
A hypothetical subatomic particle that always travels faster than the speed of light.
tachy·onic adj.
tachyon  (tk-n)
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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