Definition from Wiktionary, the free dictionary
electron (plural electrons)
- (physics) The subatomic particle having a negative charge and orbiting the nucleus; the flow of electrons in a conductor constitutes electricity.
- (chemistry, obsolete) Alloys of magnesium and other metals, like aluminum or zinc, that were manufactured by the German company Chemische Fabrik Griesheim-Elektron.
Related terms 
the negatively charged subatomic particles that orbit atoms
See also 
electron (plural electrones)