{ Pyr″a‐zine (?), n. Also –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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.