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- n. An elementary particle, a lepton, having a mass almost twice that of a proton and a negative charge.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a lepton of very great mass
Sorry, no etymologies found.
This is badly broken in the charged lepton sector, so one can write explicitly what the Lagrangian is, and the neutrino Majorana matrix respects the muon-tauon interchange, whereas the charged matrix does not.