What is the meaning of Tauon?
An unstable elementary particle which is a type of lepton, having a mass almost twice that of a proton, a negative charge, and a spin of ½; it decays into hadrons (usually pions) or other leptons, and neutrinos.
tauon
genitive singular of tauko
Rōmaji transcription of タウオン
Source: wiktionary.org