LATIN DICTIONARYLexicon Latīnum
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“flash” in Latin

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

flash s.
fulgor (bright, blazing; e.g., of comets, lightning, etc.; also opposed to fumus). A flash of lightning, fulgur (ἀστραπή, the lightning, inasmuch as it shines, and as a single temporary phenomenon on the horizon, instead of which sometimes fulgores is met with, but seldom the sing. fulgor. It ought to be well distinguished from fulgetrum or fulgetra; i. e., continued or repeated lightning): fulmen (κεραυνός, the lightning, inasmuch as it strikes any object). [Vid :, also, LIGHTNING.] Flash of the eye or the eyes, ardor oculorum (Cic., Balb., 21, extr.), or acies oculorum (Caes., B.G., 1, 39); vultus ardore animi micans (the look or glance flashing with wrath): to emit slight flashs of anything, jacere igniculos alicujus rei; igniculos alicujus rei ostendere (e.g., ingenii): like a flash of lightning (i. e., as quick), *fulminis instar; cum maxima celeritate.
flash v.
fulgere (to shine like lightning): micare: splendere (to sparkle, to glitter). The swords were seen flashing, micantes fulsere gladii: his eyes flashed through the mask, ex persona ardebant oculi: his eyes flash, oculi ardent (Cic., Verr., 4, 66, 148), or vultus ejus ardore micat (if with rage).

Quick answer

What is the Latin word for flash?
The usual Latin words for “flash” are fulgor, fulgur, fulgetrum; also fulmen, ingenium, fulgeō. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.