tachyon.
A hypothetical particle that travels faster than the speed of light.
Meaning & usage
A hypothetical particle that travels faster than the speed of light.
A flaw in a physical theory that predicts the existence of tachyons or similar paradoxical results. Compare with ghost.
Where this word comes from
Formed as: tachy- + -on, from ταχύς (takhús, “swift”, “rapid”). Coined by American physicist Gerald Feinberg in 1967.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.