ru·bid·i·um
noun/ruːˈbɪdiəm/
/ruːˈbɪdiəm/
[uncountable] (symbol Rb)
- 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.
铷 Word Originmid 19th cent.: modern Latin, from Latin rubidus ‘red’ (with reference to its spectral lines).