The second flavor of charged leptons (in order of increasing mass), with electric charge -1
a charged (positive or negative) particle associated with the nuclear force field with a weak interaction with matter and a spin similar to the electron
an elementary particle with a negative charge and a half-life of 2 microsecond; decays to electron and neutrino and antineutrino
The second lepton (in order of increasing mass), with electric charge -1 More Information: Leptons, Cosmic Rays