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promethium

Pronunciation: /prəˈmiːθɪəm/
Definition of promethium

noun

[mass noun]
  • the chemical element of atomic number 61, a radioactive metal of the lanthanide series. It was first produced artificially in a nuclear reactor and occurs in nature in traces as a product of uranium fission. (Symbol: Pm)

Origin:

1940s: modern Latin, from the name of the Titan Prometheus

promethium in other Oxford dictionaries

Definition of promethium in the US English dictionary
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