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From The Collaborative International Dictionary of English v.0.48:
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.