#particle  a body having finite mass and internal structure but negligible dimensions
  supertype:  #body.natural_object  an individual 3-dimensional object that has mass and that is distinguishable from other objects; "heavenly body"
  subtype:  #virion  a complete viral particle; nucleic acid and capsid (and a lipid envelope in some viruses)
  subtype:  #alpha_particle__alphaparticle  a positively charged particle that is the nucleus of the helium atom; emitted from natural or radioactive isotopes
  subtype:  #beta_particle  a high-speed electron or positron emitted in the decay of a radioactive isotope
  subtype:  #boson  any particle that obeys Bose-Einstein statistics but not the Pauli exclusion principle; all nuclei with an even mass number are bosons
     subtype:  #gauge_boson__gaugeboson  a particle that mediates the interaction of two elementary particles
        subtype:  #gluon  a gauge boson that mediates strong interaction among quarks
        subtype:  #gravitons__graviton  a gauge boson that mediates the (extremely weak) gravitational interactions between particles
        subtype:  #intermediate_vector_bosons  a gauge boson that mediates weak interactions between particles
        subtype:  #photon  a quantum of electromagnetic radiation; an elementary particle that is its own antiparticle
     subtype:  #meson__mesotron  an elementary particle responsible for the forces in the atomic nucleus; a hadron with a baryon number of 0
        subtype:  #b-meson__bmeson  exceedingly short-lived meson
        subtype:  #J_particle__psi_particle__psiparticle  a neutral meson with a large mass
        subtype:  #kaon__kappa-meson__kappameson__k-meson__kmeson__K_particle  an unstable meson produced as the result of a high-energy particle collision
        subtype:  #pion__pi-meson  a meson produced as the result of high-energy particle collision
  subtype:  #deuteron  the nucleus of deuterium; consists of one proton and one neutron; used as a bombarding particle in accelerators
  subtype:  #elementary_particle__fundamental_particle__fundamentalparticle__subatomicparticle  a particle that is less complex than an atom; regarded as constituents of all matter
     subtype:  #antilepton  the antiparticle of a lepton
        subtype:  #antimuon__positive_muon  the antiparticle of a muon; decays to positron and neutrino and antineutrino
        subtype:  #antineutrino  the antiparticle of a neutrino
        subtype:  #antitauon__tau-plus_particle  an antilepton of very great mass
        subtype:  #positron__antielectron  an elementary particle with positive charge; interaction of a positron and an electron results in annihilation
     subtype:  #antiparticle  a particle that has the same mass as another particle but has opposite values for its other properties; interaction of a particle and its antiparticle results in annihilation and the production of radiant energy
     subtype:  #antiquark  the antiparticle of a quark
     subtype:  #hadron  any elementary particle that interacts strongly with other particles
        subtype:  #antibaryon  the antiparticle of a baryon; a hadron with a baryon number of -1
        subtype:  #antimeson  the antiparticle of a meson
        subtype:  #baryon__heavy_particle__heavyparticle  any of the elementary particles having a mass equal to or greater than that of a proton and that participate in strong interactions; a hadron with a baryon number of +1
           subtype:  #hyperon  any baryon that is not a nucleon; unstable particle with mass greater than a neutron
              subtype:  #lambda_particle__lambda_hyperon  an electrically neutral baryon with isotopic spin 1
           subtype:  #nucleon  a constituent (proton or neutron) of an atomic nucleus
              subtype:  #antineutron  the antiparticle of a neutron
              subtype:  #antiproton  an unstable negatively charged proton; the antiparticle of a proton
              subtype:  #neutron  an elementary particle with 0 charge and mass about equal to a proton; enters into the structure of the atomic nucleus
              subtype:  #proton  a stable particle with positive charge equal to the negative charge of an electron
                 subtype:  #hydrogen_ion  a positively charged atom of hydrogen; that is to say, a normal hydrogen atomic nucleus
        subtype:  #meson__mesotron  an elementary particle responsible for the forces in the atomic nucleus; a hadron with a baryon number of 0
     subtype:  #lepton  an elementary particle that participates in weak interactions; has a baryon number of 0
        subtype:  #electron__negatron  an elementary particle with negative charge
           subtype:  #delta_ray__deltaray  an electron ejected from matter by ionizing radiation
           subtype:  #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
           subtype:  #photoelectron  an electron that is emitted from an atom or molecule by an incident photon
           subtype:  #valence_electron__valenceelectron  an electron in the outer shell of an atom which can combine with other atoms to form molecules
        subtype:  #negative_muon__muon__mu-meson  an elementary particle with a negative charge and a half-life of 2 microsecond; decays to electron and neutrino and antineutrino
        subtype:  #neutrino  an elementary particle with zero charge and zero mass
        subtype:  #tauon__tau-minus_particle__tauminusparticle  a lepton of very great mass
     subtype:  #quark  hypothetical truly fundamental particle in mesons and baryons; there are supposed to be six flavors of quarks (and their antiquarks), which come in pairs; each has an electric charge of +2/3 or -1/3
        subtype:  #bottom_quark__beauty_quark  a quark with a charge of -1/3 and a mass about 10,000 times that of an electron
        subtype:  #charm_quark  a quark with an electric charge of +2/3 and a mass 2900 times that of an electron and a charm of +1
        subtype:  #down_quark  a stable quark with an electric charge of -1/3 and a mass 607 times that of an electron
        subtype:  #strange_quark__strangequark__squark  a quark with an electric charge of -1/3 and a mass 988 times that of an electron and a strangeness of -1
        subtype:  #top_quark__topquark__truth_quark__truthquark  a hypothetical quark with a charge of +2/3 and a mass more than 100,000 times that of an electron
        subtype:  #up_quark  a stable quark with an electric charge of +2/3 and a mass 607 times that of an electron
     subtype:  #strange_particle__strangeparticle  an elementary particle with non-zero strangeness
  subtype:  #fermion  any particle that obeys Fermi-Dirac statistics and is subject to the Pauli exclusion principle
     subtype:  #baryon__heavy_particle__heavyparticle  any of the elementary particles having a mass equal to or greater than that of a proton and that participate in strong interactions; a hadron with a baryon number of +1
     subtype:  #lepton  an elementary particle that participates in weak interactions; has a baryon number of 0
  subtype:  #magnetic_monopole  a hypothetical particle with a single magnetic pole instead of the usual two
  subtype:  #micelle  an electrically charged particle built up from polymeric molecules or ions and occurring in certain colloidal electrolytic solutions like soaps and detergents
  subtype:  #prion  (microbiology) an infectious protein particle similar to a virus but lacking nucleic acid; thought to be the agent responsible for scrapie and other degenerative diseases of the nervous system
  subtype:  #virino  (microbiology) a hypothetical infectious particle thought to be the cause of scrapie and other degenerative diseases of the central nervous system; consists of nucleic acid in a protective coat of host cell proteins
  subtype:  #scintilla  a sparkling glittering particles
  subtype:  #superstring  a hypothetical particle that is the elementary particle in a theory of space-time
  subtype:  #thermion  an electrically charged particle (electron or ion) emitted by a substance at a high temperature

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