Dictionary![]() ![]() neu•tronPronunciation: (nOO'tron, nyOO'-), [key] —n. Physics. an elementary particle having no charge, mass slightly greater than that of a proton, and spin of ½: a constituent of the nuclei of all atoms except those of hydrogen. Symbol: n Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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