/ prəˈmiːθiəm; NAmE / noun
[ U ] ( symb 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.
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WORD ORIGIN
1940s: modern Latin , from the name of the Titan Prometheus, a demigod in Greek mythology who was worshipped by craftsmen.