Meaning of ELECTRON in English

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

Webster's New International English Dictionary.      Новый международный словарь английского языка Webster.