Source : Webster's Revised Unabridged Dictionary (1913)

Frenzy \Fren"zy\, n.; pl. {Frenzies}. [OE. frenesie, fransey, F.
   fr['e]n['e]sie, L. phrenesis, fr. Gr. ? for ? disease of the
   mind, phrenitis, fr. ? mind. Cf. {Frantic}, {Phrenitis}.]
   Any violent agitation of the mind approaching to distraction;
   violent and temporary derangement of the mental faculties;
   madness; rage.

         All else is towering frenzy and distraction. --Addison.

         The poet's eye in a fine frenzy rolling. --Shak.

   Syn: Insanity; lunacy; madness; derangment; alienation;
        aberration; delirium. See {Insanity}.

Frenzy \Fren"zy\, a.
   Mad; frantic. [R.]

         They thought that some frenzy distemper had got into
         his head.                                --Bunyan.

Frenzy \Fren"zy\, v. t.
   To affect with frenzy; to drive to madness [R.] ``Frenzying
   anguish.'' --Southey.

Source : WordNet®

frenzy
     n : state of violent mental agitation [syn: {craze}, {delirium},
          {fury}, {hysteria}]
     [also: {frenzied}]