sparkover \ˈ ̷ ̷ˌ ̷ ̷ ̷ ̷\noun (-s) Etymology: from spark over, v. : a disruptive electric discharge; especially: an undesired sparking (as in charging a Leyden jar) between two conductors < high-voltage generator operating in a pressure chamber to prevent electrical sparkover — Science > < sparkover potential >