#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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