Source : Webster's Revised Unabridged Dictionary (1913)

Rabid \Rab"id\, a.[L. rabidus, from rabere to rave. See {Rage},
   n.]
   1. Furious; raging; extremely violent.

            The rabid flight Of winds that ruin ships.
                                                  --Chapman.

   2. Extreme, unreasonable, or fanatical in opinion;
      excessively zealous; as, a rabid socialist.

   3. Affected with the distemper called rabies; mad; as, a
      rabid god or fox.

   4. (Med.) Of or pertaining to rabies, or hydrophobia; as,
      rabid virus.

Source : WordNet®

rabid
     adj : marked by excessive enthusiasm for and intense devotion to a
           cause or idea; "rabid isolationist" [syn: {fanatic}, {fanatical},
            {overzealous}]