Source : Webster's Revised Unabridged Dictionary (1913)

Glyoxaline \Gly*ox"a*line\, n. (Chem.)
   A white, crystalline, organic base, {C3H4N2}, produced by the
   action of ammonia on glyoxal, and forming the origin of a
   large class of derivatives hence, any one of the series of
   which glyoxaline is a type; -- called also {oxaline}.

Source : WordNet®

glyoxaline
     n : an organic base C3H4N2; a histamine inhibitor [syn: {imidazole},
          {iminazole}]