The Collaborative International Dictionary of English v.0.48:

Parabanic \Par`a*ban"ic\, a. [Gr. ? to pass over.] (Chem.)
   Pertaining to, or designating, a nitrogenous acid which is
   obtained by the oxidation of uric acid, as a white
   crystalline substance (C3N2H2O3); -- also called oxalyl
   urea.
   [1913 Webster]