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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.
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.)
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.
interparticle combined form of particle.
ion an electrically charged particle created in a gas, as by an electric discharge. [1/2 definitions]
magneton a unit used to express the magnetic moment of an atomic or subatomic particle.
molecule a single atom or several atoms bound together electromagnetically, forming the smallest particle that possesses all the characteristic physical and chemical properties of an element or compound. [2 definitions]
mote a fine particle of dust; speck.