promethium
noun/prəˈmiːθiəm/
/prəˈmiːθiəm/
[uncountable] (symbol Pm)
- a chemical element. Promethium is a radioactive metal that was first produced artificially in a nuclear reactor and is found in small amounts in nature.Word Origin1940s: modern Latin, from the name of the Titan Prometheus, a demigod in Greek mythology who was worshipped by craftsmen.
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promethium