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| alpha particle |
a positively charged particle given off as radiation from some fission or decay processes, consisting of two protons and two neutrons. |
| baryon |
in physics, a heavy subatomic particle of half-integral spin, such as a proton, neutron, or hyperon. |
| capsid |
the outer protein shell of a virus particle that surrounds its nucleic acid. |
| centrifugal force |
a force that tends to pull a particle or body outward, away from the axis around which it rotates. (Cf. centripetal force.) |
| centripetal force |
a force that tends to pull a particle or body toward the axis around which it rotates. (Cf. centrifugal force.) |
| 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. |
| coronavirus |
a type of virus that causes a variety of diseases in humans and other animals ranging from the common cold to potentially fatal illnesses. A coronavirus is an RNA virus of the family Coronaviridae and is so-named because the outer perimeter of each round virus particle resemble a spiky crown similar in shape to the sun's corona. [1/2 definitions] |
| corpuscle |
a very small particle of matter, such as a photon or electron. [1/2 definitions] |
| culm1 |
particle waste from coal screening. [1/3 definitions] |
| delta ray |
any particle emitted from matter following bombardment by ionizing radiation. |
| 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. |
| electron |
a negatively charged particle, considered a fundamental unit of matter, that exists independently or outside the nucleus of an atom. |
| excite |
in physics, to raise (an atom, particle, or molecule) to a state of higher energy. [1/5 definitions] |
| field magnet |
a magnet used to produce and maintain a magnetic field in an electrical device such as a motor, generator, or particle accelerator. |
| fundamental particle |
an elementary particle. |
| gluon |
in physics theory, a massless particle or type of energy that binds quarks together and thus forms protons, neutrons, and the like. |
| grain |
any tiny, hard particle. [1/11 definitions] |
| granule |
a small particle or grain. |
| graviton |
in physics, a theoretical particle that acts as the unit of gravitational energy. |
| hadron |
in particle physics, any particle made up of quarks and held together by the strong force. |
| interparticle |
combined form of particle. |
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