ATOMIC NUMBER 57

 I. (noun) 

Sense 1

Meaning:

A white soft metallic element that tarnishes readily; occurs in rare earth minerals and is usually classified as a rare earth

Synonyms:

atomic number 57; La; lanthanum

Classified under:

Nouns denoting substances

Hypernyms ("atomic number 57" 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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