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antineutrino in physics, the antiparticle of a neutrino.
lepton2 any of a group of subatomic particles such as the electron, muon, and neutrino that have a spin of one-half and very little or no mass.
neutrinoless combined form of neutrino.
weak interaction a weak force between elementary particles that is responsible for beta decay, neutrino absorption and emission, and some particle decay. (Cf. strong interaction.)