The Collaborative International Dictionary of English v.0.48:

Hippuric \Hip*pu"ric\, a. [Gr. "i`ppos horse + o"y`ron urine:
   cf. F. hippurique.] (Physiol. Chem.)
   Obtained from the urine of horses; as, hippuric acid.
   [1913 Webster]

   Hippuric acid, a white crystalline substance, containing
      nitrogen, present in the urine of herbivorous animals, and
      in small quantity in human urine. By the action of acids,
      it is decomposed into benzoic acid and glycocoll.
      [1913 Webster]