flash (subs.) Copy link Outline I. Brightness, sheenII. Of lightning • flash (subs.): I. Brightness, sheen: fulgor, ōris, m.: the f. of arms, f. armorum, Hor.: the f. of mirrors, f. speculorum, Plin. 7, 15, 13. Prov.: a f. in the pan, fumum ex f. dare, Hor. A. P. 143: v. brightness. II. Of lightning: fulgur, fulmen (the latter referring to the lightning as striking and destroying): v. lightning.