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protonOne entry found for proton. Main Entry: pro·ton Pronunciation: 'prO-"tän Function: noun Etymology: Greek prOton, neuter of prOtos first -- more at PROT- : an elementary particle that is identical with the nucleus of the hydrogen atom, that along with the neutron is a constituent of all other atomic nuclei, that carries a positive charge numerically equal to the charge of an electron, and that has a mass of 1.673 x 10-27 kilogram - pro·ton·ic /prO-'tä-nik/ adjective
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