Pyrazine \Pyr"a*zine\, n. Also -zin \-zin\ . [Pyridine + Gr. ?
not + ? life.] (Org. Chem.)
A feebly basic solid, {C4H4N2}, obtained by distilling
piperazine with zinc dust, and in other ways. Also, by
extension, any of various derivatives of the same.
[Webster 1913 Suppl.]