yttrium

noun
yt·​tri·​um | \ ˈi-trē-əm How to pronounce yttrium (audio) \

Definition of yttrium

: a metallic element with atomic number 39 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, alloys, and treatments for certain cancers — see Chemical Elements Table

First Known Use of yttrium

1814, in the meaning defined above

History and Etymology for yttrium

New Latin, from yttria yttrium oxide (Y2O3), irregular from Ytterby, town in southern Sweden

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The first known use of yttrium was in 1814

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yttrium

noun
yt·​tri·​um | \ ˈi-trē-əm How to pronounce yttrium (audio) \

Medical Definition of yttrium

: a trivalent metallic element usually included among the rare earth elements which it resembles chemically and with which it occurs in minerals symbol Y — see Chemical Elements Table

More from Merriam-Webster on yttrium

Britannica.com: Encyclopedia article about yttrium

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