: 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
Examples of lutetium in a Sentence
Recent Examples on the WebThe least abundant of these, thulium (Tm) and lutetium (Lu) are 200 times more abundant than gold.
Willy Shih, Forbes, 24 Feb. 2021
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