The story
Formed as: tachy- + -on, from τᾰχῠ́ς (tăkhŭ́s, “swift”, “rapid”). Coined by American physicist Gerald Feinberg in 1967.
Etymology from Wiktionary, CC BY-SA 4.0.
tachyon
Today it means: A hypothetical particle that travels faster than the speed of light. Full definition →