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Definition of Atomic number 68
1. Noun. A trivalent metallic element of the rare earth group; occurs with yttrium.
Exact synonyms: Er, Erbium
Generic synonyms: Metal, Metallic Element
Substance meronyms: Fergusonite, Gadolinite, Ytterbite
Generic synonyms: Metal, Metallic Element
Substance meronyms: Fergusonite, Gadolinite, Ytterbite