Source : Webster's Revised Unabridged Dictionary (1913)

Vermifuge \Ver"mi*fuge\, n. [Cf. F. vermifuge. See
   {Vermifugal}.] (Med.)
   A medicine or substance that expels worms from animal bodies;
   an anthelmintic.

Source : WordNet®

vermifuge
     n : a medication capable of causing the evacuation of parasitic
         intestinal worms [syn: {anthelmintic}, {anthelminthic}, {helminthic}]