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| antiproton |
in physics, the antiparticle of a proton. |
| baryon |
in physics, a heavy subatomic particle of half-integral spin, such as a proton, neutron, or hyperon. |
| chromodynamics |
in particle physics, the theory of the strong interaction between quarks and gluons, fundamental particles that form hadrons such as the proton and neutron. |
| deuterium |
an isotope of hydrogen that has one proton and one neutron in each nucleus; heavy hydrogen. (Cf. protium, tritium.) |
| deuteron |
a particle composed of one proton and one neutron that is equivalent to the nucleus of a deuterium atom and that has a positive charge. |
| hydrogen |
a chemical element that contains one proton in each nucleus and that occurs naturally in many compounds such as water, acids, petroleum hydrocarbons, and carbohydrates, and in pure form as a highly flammable, lighter-than-air gas used in many industrial applications, such as the hydrogenation of fats and oils. (symbol: H) (Cf. deuterium, protium, tritium.) |
| meson |
any of a group of elementary particles that react strongly with other particles, and that have a mass between that of the electron and that of the proton. |
| neutron |
an elementary particle having no charge, spin of one-half, and mass approximately equal to a proton, present in the nucleus of all atoms except the common isotope of hydrogen. |
| nucleon |
a proton or neutron, esp. as a component of an atomic nucleus. |
| protium |
the nonradioactive, most common isotope of hydrogen, having one proton and no neutrons in the nucleus of each atom. (Cf. deuterium, tritium.) |
| upsilon |
in physics, any of several ephemeral particles whose mass is ten times that of a proton. [1/2 definitions] |
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