lutetium
noun
lu·te·tium lü-ˈtē-sh(ē-)əm 
: a metallic chemical element of the rare-earth group that has few practical applications but is sometimes used as a catalyst in cracking and as a radiation source for treatment of certain cancers see Chemical Elements Table
Example Sentences
Recent Examples on the Web The least abundant of these, thulium (Tm) and lutetium (Lu) are 200 times more abundant than gold. 
Willy Shih, Forbes, 24 Feb. 2021
Willy Shih, Forbes, 24 Feb. 2021 Word History
Etymology
New Latin, from Latin Lutetia, ancient name of Paris
First Known Use
1907, in the meaning defined above
Medical Definition
lutetium
noun
lu·te·tium
variants also lutecium
lü-ˈtē-sh(ē-)əm
: a metallic element of the rare-earth group —symbol Lu see Chemical Elements Table
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