lepton

Definitions of lepton
  1. noun
    100 lepta equal 1 drachma in Greece
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    type of:
    Greek monetary unit
    monetary unit in Greece
  2. noun
    an elementary particle that participates in weak interactions; has a baryon number of 0
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    types:
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    electron, negatron
    an elementary particle with negative charge
    mu-meson, muon, negative muon
    an elementary particle with a negative charge and a half-life of 2 microsecond; decays to electron and neutrino and antineutrino
    neutrino
    an elementary particle with zero charge and zero mass
    tau-minus particle, tauon
    a lepton of very great mass
    delta ray
    an electron ejected from matter by ionizing radiation
    free electron
    electron that is not attached to an atom or ion or molecule but is free to move under the influence of an electric field
    photoelectron
    an electron that is emitted from an atom or molecule by an incident photon
    valence electron
    an electron in the outer shell of an atom which can combine with other atoms to form molecules
    type of:
    elementary particle, fundamental particle
    (physics) a particle that is less complex than an atom; regarded as constituents of all matter
    fermion
    any particle that obeys Fermi-Dirac statistics and is subject to the Pauli exclusion principle
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