rubidium
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 词源mid 19th cent.: modern Latin, from Latin rubidus ‘red’ (with reference to its spectral lines).