WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. the antiparticle of a muon; decays to positron and neutrino and antineutrino
Word Usage
"But these were expected to decay very rapidly and the observed electrons and muons were therefore interpreted as products of decay from reactions: tau - electron (or muon) + neutrinos antitau - antimuon (or positron) + neutrinos"