Definition of rubidium noun from the Oxford Advanced Learner's Dictionary



BrE BrE//rʊˈbɪdiəm//
; NAmE NAmE//rʊˈbɪdiəm//
[uncountable] (symbol Rb)
jump to other results
a chemical element. Rubidium is a rare soft silver-coloured metal that reacts strongly with water and burns when it is brought into contact with air. Word Originmid 19th cent.: modern Latin, from Latin rubidus ‘red’ (with reference to its spectral lines).
See the Oxford Advanced American Dictionary entry: rubidium