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}.
[1913 Webster]