promethium

noun
pro·me·thi·um | \prə-ˈmē-thē-əm \

Definition of promethium 

: a radioactive metallic element of the rare-earth group obtained as a fission product of uranium or from neutron-irradiated neodymium — see Chemical Elements Table

First Known Use of promethium

1948, in the meaning defined above

History and Etymology for promethium

New Latin, from Latin Prometheus

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The first known use of promethium was in 1948

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promethium

noun
pro·me·thi·um | \prə-ˈmē-thē-əm \

Medical Definition of promethium 

: a radioactive metallic element of the rare-earth group obtained as a fission product of uranium or from neutron-irradiated neodymium symbol Pm — see Chemical Elements Table

More from Merriam-Webster on promethium

Britannica.com: Encyclopedia article about promethium

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