Phrases starting with the letter: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Previous word: rubicund
Next word: rubiginous
Definition of: rubidium
(r
·bid′ē·əm) noun
A silvery-white, very reactive alkali metal (symbol Rb, atomic number 37), abundant but difficult to prepare in pure form, and having two naturally occurring isotopes, one of which is radioactive with a very long half-life. [<NL <L rubidus red]
Comment about this word, ask questions, or add new information about this topic: