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Definition of Promethium
1. Noun. A soft silvery metallic element of the rare earth group having no stable isotope; was discovered in radioactive form as a fission product of uranium.
Definition of Promethium
1. Noun. a metallic chemical element (''symbol'' Pm) with an atomic number of 61. ¹
¹ Source: wiktionary.com
Definition of Promethium
1. [n -S]
Lexicographical Neighbors of Promethium
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