Now updated for CSW19. New words, if any, and new inflections of existing words, are shown in red.
| anion | an ion with a negative electrical charge, having gained one or more electrons. |
| antiatom | an atom composed of ANTIPARTICLES. |
| antibaryon | the antiparticle of the BARYON. |
| antielectron | the antiparticle of the ELECTRON. |
| antilepton | the antiparticle of the LEPTON. |
| antimatter | matter composed of antiparticles. |
| antimuon | the antiparticle of a MUON. |
| antineutrino | the antiparticle of the NEUTRINO. |
| antineutron | the antiparticle of the NEUTRON. |
| antiparticle | the 'pair' of an elementary particle, particle and antiparticle being mutually destructive, having the same mass and spin but having opposite values for their other properties (eg charge, baryon number, strangeness). |
| antiproton | the antiparticle of the PROTON. |
| antiquark | the antiparticle of the QUARK. |
| anyon | an elementary particle or particle-like excitation having properties intermediate between those of bosons and fermions. |
| atom | the smallest particle in an element which can take part in a chemical reaction. |
| axion | a hypothetical subatomic particle. |
| baryon | a heavy subatomic particle involved in strong interactions with other subatomic particles and composed of three quarks bound together by GLUON. |
| baryonic | relating to BARYONS, heavy subatomic particles involved in strong interactions with other subatomic particles. |
| boson | any of a class of subatomic particles whose behaviour is governed by Bose-Einstein statistics, according to which, under certain conditions, particles of the same kind will accumulate in each low-energy quantum state. |
| bosonic | relating to a BOSON, a kind of subatomic particle. |
| carbanion | an ION carrying a negative electrical charge at the carbon position. |
| charmonium | any of various elementary particles consisting of a charm quark and an antiquark > CHARMONIA. |
| classon | an elementary atomic particle. |
| counterion | an ION having a charge opposite to that of the substance with which it is associated. |
| crypton | a hypothetical dark matter particle. |
| deuteron deuton | the NUCLEUS of heavy hydrogen, of mass 2, carrying unit positive charge. |
| diplon | an alternative name for DEUTERON, the nucleus of heavy hydrogen. |
| diquark | a low energy configuration of two QUARKS. |
| duplet | a pair of ELECTRONS forming a single bond between atoms. |
| electron | a minute particle charged with electricity, or a unit charge having inertia, normally forming part of an ATOM but capable of isolation as in cathode rays. |
| electroweak | of or relating to a theory unifying electromagnetic and weak interactions between particles. |
| exciton | a bound hole-electron pair in a semiconductor. |
| excitonic | relating to an EXCITON. |
| fermion | one of a group of subatomic particles, such as PROTONS, ELECTRONS and NEUTRONS, having half-integral spin and obeying the exclusion principle. |
| fermionic | of or like a FERMION. |
| glueball | a hypothetical subatomic particle consisting exclusively of gluons bound together. |
| gluon | the name given to a hypothetical particle thought of as passing between QUARKS and so signifying the force that holds them together. |
| gravitino | a hypothetical particle associated with the gravitational force. |
| graviton | a hypothetical quantum of gravitational field energy. |
| hadron | one of a class of subatomic particles, including BARYONS and MESONS. |
| hadronic | of or like a HADRON, one of a class of subatomic particles. |
| hyperon | any BARYON that is not a neutron. |
| interelectron | operating between ELECTRONS. |
| ion | an electrically-charged particle formed by loss or gain of ELECTRONS by an ATOM, effecting by its migration the transport of electricity. |
| ionicity | the state of existing as an Ion. |
| ionise ionize | to convert (an atom) into an ion by loss or gain of one or more electrons. |
| isospin | a quantum number applied to members of closely related groups of particles to express and explain the theory that such particles (eg protons and neutrons) are in fact states of the same particle differing with regard to electric charge. |
| isotone | one of a number of NUCLIDES having the same number of neutrons in the nucleus with differing numbers of protons. |
| isotope | one of two more atoms with the same atomic number that contain different numbers of neutrons. |
| isotopic | of or like an ISOTOPE. |
| isotopically | (adv.) ISOTOPIC. |
| isotopy | the state of being ISOTOPIC. |
| kaon | an elementary particle of the MESON family. |
| kaonic | of or like a KAON, an elementary particle of the meson family. |
| lepton | any of a group of subatomic particles with weak interactions, including electrons, negative muons, tau particles and neutrinos, as opposed to a BARYON. |
| leptonic | relating to a LEPTON, a subatomic particle. |
| meson | a short-lived subatomic particle of smaller mass than a PROTON. |
| mesonic | relating to the MESON, a short-lived subatomic particle of smaller mass than a proton. |
| mesotron | formerly a MESON, now a MUON. |
| monopole | a particle, thought to exist, that has a single magnetic charge. |
| multipion | comprising many PIONS, pi-meson particles. |
| multiplet | a group of elementary particles whose members differ only in electric charge. |
| muon | a LEPTON formerly classified as a MESON. |
| muonic | relating to a MUON, a kind of subatomic particle. |
| negaton negatron | a hypothetical atomic particle with mass equal to that of a PROTON, but with a negative charge equal to that of an electron. |
| neutretto | a name suggested for a neutral meson; a type of neutrino. |
| neutrino | an uncharged particle with zero mass when at rest. |
| neutrinoless | without neutrinos. |
| neutron | a particle in the nucleus of an atom, which is without electrical charge and with approximately the same mass as a proton. |
| neutronic | of or like a NEUTRON. |
| nonatomic | not atomic. |
| nuclear | pertaining to a nucleus. |
| nucleide nuclide | an atom of specified atomic number and mass number. |
| nucleon | a general name for a NEUTRON or PROTON. |
| nucleonic | pertaining to nuclear physics. |
| nuclide | see NUCLEIDE. |
| nuclidic | of or like a NUCLIDE, an atom of specified atomic number and mass number. |
| oxyanion | an anion containing one or more oxygen atoms bonded to another element. |
| parton | a hypothetical particle that is held to be a constituent of nucleons. |
| pentaquark | a hypothetical subatomic particle consisting of a group of five quarks (as compared to the usual three quarks). |
| photoelectron | an electron released from a surface by a PHOTON. |
| photino | a hypothetical elementary particle. |
| photon | a quantum of light or other electromagnetic radiation. |
| pion | a pi-meson. |
| pionic | relating to a PION, a pi-meson. |
| polaron | a free ELECTRON trapped by polarization charges on the surrounding molecules. |
| positon positron | a particle differing from the electron in having a positive charge. |
| positronium | a POSITRON and and an ELECTRON bound together in a short-lived unit, similar to a hydrogen atom. |
| preon | a hypothetical particle, a possible constituent of a quark. |
| proton | a stable subatomic particle, occurring in all atomic nuclei, which is a BARYON with a positive charge equal and opposite to that of the ELECTRON and a mass 1836 times the electron's mass. |
| protonic | relating to a PROTON. |
| quantum | a naturally fixed minimum amount of some quantity > QUANTA or QUANTUMS. |
| quark | a fundamental subatomic particle (thought to exist in six types: bottom, top, up, down, charmed and strange) which is not directly observable but is suggested as a unit out of which other subatomic particles are formed. |
| quasiparticle | a composite entity (as a vibration in a solid) that is analogous in its behavior to a single particle. |
| soliton | a solitary wave; a quantum which corresponds to a solitary wave in its transmission. |
| sparticle | a shadow particle such as a squark believed to have been produced at the time of the Big Bang. |
| squark | a hypothetical boson partner of a QUARK. |
| strange | a type of QUARK > STRANGES. |
| subatom | a constituent part of an ATOM. |
| subatomic | relating to particles constituting the atom or processes that occur within the atom or at less than atomic level. |
| subatomics | the study of subatomic particles. |
| subnucleus | a secondary nucleus > SUBNUCLEI. |
| superatom | a cluster of atoms behaving like a single ATOM. |
| superparticle | a kind of particle postulated by the theory of supersymmetry. |
| superstring | a hypothetical very small one-dimensional particle from which other fundamental particles arise |
| tachyon | a theoretical elementary particle moving faster than light. [Gk. tachys, swift]. |
| tachyonic | relating to a TACHYON, a faster-than-light particle. |
| tardyon | a subatomic particle that travels more slowly than the speed of light. |
| tauon | a LEPTON of mass about 3600 times greater than that of an electron. |
| thermion | an electrically charged particle, an electron or ion, emitted by an incandescent body. |
| triton | the nucleus of tritium, composed of one proton and two neutrons. |
| wavicle | an entity having characteristic properties of both waves and particles. |
| weakon | a kind of subatomic particle associated with the electroweak force. |
| ylem | a form of matter hypothesized by proponents of the big bang theory to have existed before the formation of the chemical elements. |