Definify.com

Webster 1913 Edition

Noun.

[

Quin

oline + gly

oxal

(Chem.)

Any one of a series of complex nitrogenous bases obtained by the union of certain aniline derivatives with glyoxal or with certain ketones.

[Written also

chinoxaline

quinoxaline ‎(plural quinoxalines)

(organic chemistry) A bicyclic heterocycle consisting of a benzene ring fused to that of pyrazine.

bicyclic heterocycle