po·tas·si·um
noun/pəˈtæsiəm/
/pəˈtæsiəm/
[uncountable] (symbol K)
- a chemical element. Potassium is a soft silver-white metal that exists mainly in compounds which are used in industry and farming.
钾 Oxford Collocations DictionaryPotassium is used before these nouns:- salt
Word Originearly 19th cent.: from potash (earlier potass, from French potasse) + -ium.