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From The Collaborative International Dictionary of English v.0.48:
Viridine \Vir"i*dine\, n. [L. viridis green.] (Chem.) A greenish, oily, nitrogenous hydrocarbon, C12H19N7, obtained from coal tar, and probably consisting of a mixture of several metameric compounds which are higher derivatives of the base pyridine. [1913 Webster]