fulgus

fulgus [CLbyform offulgur] , flash of lightning. Cf. Isid. Etym. XIII 9. 2. ~us, †sive [MS: scilicet] dicitur quia tangit, fulgor quia incendit, i. splendor [‥] GlH F 953; ~us, fulgor, fulmen, tria nomina sunt; ~us tangit, fulgor incendit, fulmen findit ideo et cum ternis radiis finguntur Osb. Glouc. Deriv. 242.