[yt.tri.um] n [NL, fr. yttria yttrium oxide, irreg. fr. Ytterby, town in southern Sweden] (1822): a metallic element usu. included among the rare-earth metals which it resembles chemically and with which it usu. occurs in minerals
YTTRIUM
Meaning of YTTRIUM in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012