alkargen

from The Collaborative International Dictionary of English v.0.48

Alkargen \Al*kar"gen\, n. [Alkarsin + oxygen.] (Chem.)
   Same as {Cacodylic acid}.
   [1913 Webster]

from The Collaborative International Dictionary of English v.0.48

Cacodylic \Cac`o*dyl"ic\, a. (Chem.)
   Of, pertaining to, or derived from, cacodyl.
   [1913 Webster]

   {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}.
      [1913 Webster]