n.
Pronunciation: ' i-tr ē - ə m
Function: noun
Etymology: New Latin, from yttria yttrium oxide (Y 2 O 3 ), irregular from Ytterby, town in southern Sweden
Date: 1814
: a metallic element usually included in the rare-earth group that occurs usually with other rare earth elements in minerals and is used especially in phosphors, YAG lasers, and superalloys ― see ELEMENT table