Pronunciation: (i-lek'tron), [key]
1. Also called negatron. Physics, Chem.an elementary particle that is a fundamental constituent of matter, having a negative charge of 1.602 × 10-19 coulombs, a mass of 9.108 × 10-31 kilograms, and spin of ½, and existing independently or as the component outside the nucleus of an atom.
2. Elect.a unit of charge equal to the charge on one electron.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.