promethium

noun
pro·​me·​thi·​um | \ prə-ˈmē-thē-əm How to pronounce promethium (audio) \

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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More Definitions for promethium

promethium

noun
pro·​me·​thi·​um | \ prə-ˈmē-thē-əm How to pronounce promethium (audio) \

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