Also called negatron. Physics, Chemistry . 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 1 / 2 , and existing independently or as the component outside the nucleus of an atom.

Electricity . a unit of charge equal to the charge on one electron.

noun

atom , subatomic particle