Source : Webster's Revised Unabridged Dictionary (1913)

Oxamic \Ox*am"ic\, a. [Oxalic + amido] (Chem.)
   Pertaining to, or designating, an acid {NH2.C2O2.HO} obtained
   as a fine crystalline powder, intermediate between oxalic
   acid and oxamide. Its ammonium salt is obtained by boiling
   oxamide with ammonia.