Definition from Wiktionary, the free dictionary
See also Tachyon
tachyon (plural tachyons)
- (physics) A hypothetical particle that travels faster than the speed of light.
- (physics) A flaw in a physical theory that predicts the existence of tachyons or similar paradoxical results. Compare with ghost.
Derived terms 
See also 
tachyon m (plural tachyons)
- (physics) tachyon