Source : Webster's Revised Unabridged Dictionary (1913)

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.