• Webster's Revised Unabridged Dictionary
    • n Sideflash (Elec) A disruptive discharge between a conductor traversed by an oscillatory current of high frequency (as lightning) and neighboring masses of metal, or between different parts of the same conductor.
    • ***
Century Dictionary and Cyclopedia
    • n sideflash In electricity, the disruptive discharge between neighboring parts of a bent conductor which sometimes occurs in the case of oscillatory currents of high frequency; the spark between a lightning-rod and neighboring masses of metal induced by an oscillatory discharge of lightning.
    • ***