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Definition of: electron
(i·lek′tron) noun
An electrically charged particle of the atom: it carries the unit charge of negative electricity, estimated at 4.8 × 10-10cgs electrostatic units, and has a mass approximately one eighteen-hundredth (more exactly 1/1837) of that of the proton. Electrons are emitted in the form of beta particles and cathode rays.
—free electron An electron not permanently bound to any atom and free to move within the limits of a given substance or material, as in a galvanic current. [<Gk. ēlektron amber]
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