tauon

[taw-on, tou-] /ˈtɔ ɒn, ˈtaʊ-/
noun, Physics.
Origin
tau + -on1
British Dictionary definitions for tauon

tauon

/ˈtaʊɒn/
noun
1.
(physics) a negatively charged elementary particle of mass 3477.48 × electron mass classed as a lepton, with an associated antiparticle and neutrino
Word Origin
C20: from Greek letter tau + -on