Source : Webster's Revised Unabridged Dictionary (1913)

Anthelmintic \An`thel*min"tic\ ([a^]n`th[e^]l*m[i^]n"t[i^]k), a.
   [Pref. anti- + Gr. "e`lmins, -inqos, worm, esp. a tapeworm,
   or mawworm..] (Med.)
   Good against intestinal worms. -- n. An anthelmintic remedy.
   [Written also {anthelminthic}.]

Source : WordNet®

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