praseodymium

 
Pronunciation: /ˌpreɪzɪə(ʊ)ˈdɪmɪəm/

noun

[mass noun]
  • the chemical element of atomic number 59, a soft silvery-white metal of the lanthanide series. (Symbol: Pr)

Origin:

late 19th century: modern Latin, from German Praseodym, from Greek prasios 'leek-green' (because of its green salts) + German Didym 'didymium'