ATOMIC NUMBER 61

 I. (noun) 

Sense 1

Meaning:

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

Synonyms:

atomic number 61; Pm; promethium

Classified under:

Nouns denoting substances

Hypernyms ("atomic number 61" is a kind of...):

metal; metallic element (any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.)

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