Source : Webster's Revised Unabridged Dictionary (1913)

Xanthoproteic \Xan`tho*pro*te"ic\, a. (Physiol. Chem.)
   Pertaining to, or derived from, xanthoprotein; showing the
   characters of xanthoprotein; as, xanthoproteic acid; the
   xanthoproteic reaction for albumin.