From Old Portuguese faisca, feisca (attested in Medieval Latin as falisca), of uncertain origin. Possibly from Proto-Germanic *falwiskō(n), or from Vulgar Latin *favillesca, from favilla (“embers”). Cognate with Galician faísca and Asturian falisca. Compare also Middle French falivoche, Old High German valwische, Old Italian falavesca, Old Norse fọlski, Old Spanish fuisca and Swedish falaska.
faísca f (plural faíscas)