yttriumPronunciation: /ˈɪtrɪəm/Definition of yttrium noun [mass noun] the chemical element of atomic number 39, a greyish-white metal generally included among the rare earth elements. (Symbol: Y)Origin: early 19th century: modern Latin, from Ytterby (see ytterbium)yttrium in other Oxford dictionaries Definition of yttrium in the US English dictionary
