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electron
electron definition
elec·tron (ē lek′trän′, i-; also, -trən)
noun
Particle Physics the lightest elementary particle with an electric charge: it is a lepton with a negative charge of c. 1.602 × 10 coulomb and a rest mass of c. 9.109 × 10 kg (c. 0.511 MeV/c), which is c. of the mass of a proton: ordinarily an atom has the same number of negative electrons around the nucleus as the number of positive protons in the nucleus
Etymology: coined (1891) by G. J. Stoney (1826-1911), Ir physicist < electr(ic) + -on
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