English

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

 

rubidium

 noun
noun
BrE BrE//rʊˈbɪdiəm//
 
; NAmE NAmE//rʊˈbɪdiəm//
 
[uncountable] (symbol Rb)
 
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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 Origin mid 19th cent.: modern Latin, from Latin rubidus ‘red’ (with reference to its spectral lines).
See the Oxford Advanced American Dictionary entry: rubidium