potassium

 
Pronunciation: /pəˈtasɪəm/

noun

[mass noun]
  • the chemical element of atomic number 19, a soft silvery-white reactive metal of the alkali-metal group. (Symbol: K)

Derivatives

potassic

adjective ( Mineralogy)

Origin:

early 19th century: from potash (earlier potass, from French potasse) + -ium