Main Entry: elec·tron

Pronunciation: \i-ˈlek-ˌträn\

Function: noun

: an elementary particle consisting of a charge of negative electricity equal to about 1.602 × 10⁻¹⁹ coulomb and having a mass when at rest of about 9.109534 × 10⁻²⁸ gram or about ¹⁄₁₈₃₆ that of a proton