Source : Webster's Revised Unabridged Dictionary (1913)

Antimonial \An`ti*mo"ni*al\, a.
   Of or pertaining to antimony. -- n. (Med.) A preparation or
   medicine containing antimony.

   {Antimonial powder}, a consisting of one part oxide of
      antimony and two parts phosphate of calcium; -- also
      called {James's powder}.

Source : WordNet®

antimonial
     adj 1: of or containing antimony
     2: containing antimony; "antimonial lead"