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
What's Trending Now
More Trending Words
From the M-W Editors
Origin and Etymology of promethium
New Latin, from Latin Prometheus
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 Chemical Elements Table
Learn More about promethium
-
Britannica.com: Encyclopedia article about promethium
Seen and Heard
What made you want to look up promethium? Please tell us where you read or heard it (including the quote, if possible).
