An Etymological Dictionary of Astronomy and Astrophysics

Visible disruptive discharge of electricity between two places at opposite high potential. It is preceded by ionization of the path.

Etymology (EN): M.E., from O.E. spearca; cf. M.L.G. sparke, M.Du. spranke.

Etymology (PE): Laki âger “fire accompanied by flame,” Lori azgel daaneh-ye aatash-e sorx shodeh va godaaxteh Kurd. agir “fire” Gilaki val “prominence, flame” Tâleši kel “blazing flame” standard Pers. gorr Laki gorron “flame;”
jaraqé, probably word made by sound imitation.