What is "rubidine"

Rubidine \Ru"bi*dine\ (? or ?), n. (Chem.) A nitrogenous base homologous with pyridine, obtained from coal tar as an oily liquid, C11H17N; also, any one of the group od metameric compounds of which rubidine is the type.

n. 1 (context organic compound English) A nitrogenous base homologous with pyridine, obtained from coal tar as an oily liquid, C₁₁H₁₇N. 2 (context organic compound English) Any metameric compound in the same group as the above.