Source : Webster's Revised Unabridged Dictionary (1913)

Cacodylic \Cac`o*dyl"ic\, a. (Chem.)
   Of, pertaining to, or derived from, cacodyl.

   {Cacodylic acid}, a white, crystalline, deliquescent
      substance, {(CH3)2AsO.OH}, obtained by the oxidation of
      cacodyl, and having the properties of an exceedingly
      stable acid; -- also called {alkargen}.

Source : WordNet®

cacodylic
     adj : of or relating to cacodyl