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New American Oxford Dictionary

tachyon

tach y on |ˈtakēˌän ˈtækiɑn | noun Physics a hypothetical particle that travels faster than light. ORIGIN 1960s: from tachy- swift + -on .

 

Oxford Dictionary

tachyon

tachyon |ˈtakɪɒn | noun Physics a hypothetical particle that travels faster than light. ORIGIN 1960s: from tachy- swift + -on .

 

Duden Dictionary

Tachyon

Ta chy on Substantiv, Neutrum Physik , das |T a chyon |das Tachyon; Genitiv: des Tachyons, Plural: die Tachyonen hypothetisches Elementarteilchen, das sich stets mit Überlichtgeschwindigkeit bewegt