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
From the M-W Editors
Origin and Etymology of promethium
New Latin, from Latin Prometheus
First Known Use: 1948
Medical Dictionary
promethium
play
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 element table
Learn More about promethium
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Britannica.com: Encyclopedia article about promethium
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