An elementary particle that participates in weak interactions; has a baryon number of 0.
A fundamental fermion that does not participate in strong interactions. The electrically-charged leptons are the electron, the muon, the tau, and their antiparticles. Electrically-neutral leptons are called neutrinos.
Any of a class of light elementary particles that are not affected by the strong nuclear force; they do not interact strongly with other particles or nuclei. The leptons are comprised of the electron, muon, and tau, and their neutrinos (the electron neutrino, muon neutrino, and tau neutrino), plus their six antiparticles.

100 lepta equal 1 drachma.