Definition of promethium noun from the Oxford Advanced Learner's Dictionary

 

promethium

 noun
noun
BrE BrE//prəˈmiːθiəm//
 
; NAmE NAmE//prəˈmiːθiəm//
 
[uncountable](symbol Pm)
 
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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 Origin 1940s: modern Latin, from the name of the Titan Prometheus, a demigod in Greek mythology who was worshipped by craftsmen.
See the Oxford Advanced American Dictionary entry: promethium