ATOMIC NUMBER 68

 I. (noun) 

Sense 1

Meaning:

A trivalent metallic element of the rare earth group; occurs with yttrium

Synonyms:

atomic number 68; Er; erbium

Classified under:

Nouns denoting substances

Hypernyms ("atomic number 68" 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.)

Holonyms ("atomic number 68" is a substance of...):

fergusonite (a dark mineral consisting of oxides of yttrium and erbium and tantalum and other minerals)

gadolinite; ytterbite (a mineral that is a source of rare earths; consists of silicates of iron and beryllium and cerium and yttrium and erbium)

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