Dictionary
neu•tron
Pronunciation: (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.