Dictionary

promethium

noun pro·me·thi·um \-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 element table

Origin of PROMETHIUM

New Latin, from Latin Prometheus
First Known Use: 1948

promethium

noun pro·me·thi·um \prə-ˈmē-thē-əm\   (Medical Dictionary)

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 element table

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