A hypothetical subatomic particle that always travels faster than the speed of light.
A theoretical subatomic particle conceived of as traveling faster than the speed of light.
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.
Origin of tachyon
tachy- + -on