furor (n.)

late 14c., "fierce passion," from Old French furie, fuire "rage, frenzy" (14c.), from Latin furia "violent passion, rage, madness," from or related to furere "to rage, be mad," which is of uncertain origin. "Many etymologies have been proposed, but none is clearly the best" [de Vaan]. Romans used Furiæ to translate Greek Erinyes, the collective name for the avenging deities sent from Tartarus to punish criminals (in later accounts three in number and female). Hence, in English, figuratively, "an angry woman" (late 14c.).

1790, Italian form of furor, borrowed into English originally in the sense "enthusiastic popular admiration;" it later descended to mean the same thing as furor and lost its usefulness.