ə̇ˈlekˌträn sometimes -_trən noun
( -s )
Etymology: electr- + -on
: one of the constituent elementary particles of an atom being a charge of negative electricity equal to about 1.602×10 -19 coulomb, having a mass when at rest of about 9.109×10 -28 gram or 1/1837 that of a proton, being the least massive known charged particle, and having a magnetic moment of about 1 Bohr magneton associated with its one half quantum unit of spin