Rubidic :: Rubidic (a.) Of or pertaining to rubidium; containing rubidium.
Rubidine :: Rubidine (n.) 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..
Rubidium :: Rubidium (n.) A rare metallic element. It occurs quite widely, but in small quantities, and always combined. It is isolated as a soft yellowish white metal, analogous to potassium in most of its properties. Symbol Rb. Atomic weight, 85.2..