gadoliniumEnglishOxford New American Dictionarygadolinium /ˌɡadəˈlinēəm, ˌɡædəˈlɪniəm / ▸ noun the chemical element of atomic number 64, a soft silvery-white metal of the lanthanide series. (Symbol: Gd) – ORIGIN late 19th century : from gadolinite.