Pyrazine
Pronunciation : Pyr"a*zine
Part of Speech : n.
Definition : Defn: 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.
Also -zin. [Pyridine + Gr. not + life.] (Org. Chem.)
Source : Webster's Unabridged Dictionary, 1913