English dictionary atomic number 70 meaning and definition Definition and meaning of atomic number 70 at MeaningMonkey.org. atomic number 70 meaning and definition in the English Dictionary. ATOMIC NUMBER 70 nounDefinition of atomic number 70 (noun)a soft silvery metallic element; a rare earth of the lanthanide series; it occurs in gadolinite and monazite and xenotimesynonyms: Yb, ytterbium Source: Princeton University Wordnet
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