The Collaborative International Dictionary of English v.0.48:

furor \furor\ n.
   an interest followed with exaggerated zeal; a fad.

   Syn: fad, craze, furore, cult, rage.
        [WordNet 1.5]

   2. a sudden outburst (as of protest).

   Syn: uproar, furore.
        [WordNet 1.5]

The Collaborative International Dictionary of English v.0.48:

furore \fu*ro"re\, n. [It.]
   Excitement; commotion; enthusiasm. [Also spelled furor.]
   [1913 Webster]

WordNet (r) 3.0 (2006):

furor
    n 1: an interest followed with exaggerated zeal; "he always
         follows the latest fads"; "it was all the rage that season"
         [syn: fad, craze, furor, furore, cult, rage]
    2: a sudden outburst (as of protest) [syn: furor, furore]

Moby Thesaurus II by Grady Ward, 1.0:

152 Moby Thesaurus words for "furor":
   Alecto, Megaera, Nemesis, Tisiphone, abandon, aberration,
   abnormality, agitation, alienation, amok, ardency, ardor, attack,
   bluster, brain damage, brainsickness, brawl, broil, brouhaha, bug,
   burning rage, cacophony, chaos, clouded mind, commotion,
   convulsion, craze, craziness, crazy fancy, daftness, delirium,
   dementedness, dementia, derangement, disorientation, distraction,
   disturbance, ebullition, ecstasy, embroilment, enthusiasm,
   excitement, fanaticism, fascination, ferment, fervency, fervidness,
   fervor, fever, fire, fire and fury, fit, flap, folie, fomentation,
   foofaraw, frenzy, fume, furious rage, furore, fury, fuss, gusto,
   heart, heartiness, heat, hubbub, hysteria, impassionedness,
   infatuation, insaneness, insanity, intoxication, irrationality,
   liveliness, loss of mind, loss of reason, lunacy, madness, mania,
   manic-depressive psychosis, mental deficiency, mental derangement,
   mental disease, mental disorder, mental disturbance,
   mental illness, mental instability, mental sickness,
   mind overthrown, mindsickness, murderous insanity, oddness, orgasm,
   orgy, pandemonium, paroxysm, passion, passionateness, pixilation,
   possession, psychokinesia, queerness, rabidness, racket, rage,
   rapture, ravishment, reasonlessness, relish, row, ruckus, rumpus,
   savor, seizure, senselessness, shattered mind, sick mind, sickness,
   soul, spasm, spirit, storminess, strangeness, tearing passion,
   tempestuousness, the Erinyes, the Eumenides, the Furies,
   towering rage, transport, tumult, tumultuousness, turbulence,
   turmoil, unbalance, unbalanced mind, unsaneness, unsound mind,
   unsoundness, unsoundness of mind, uproar, upset, vehemence, verve,
   violence, warmth, warmth of feeling, wildness, witlessness, zeal,
   zealousness