English dictionary atomic number 57 meaning and definition Definition and meaning of atomic number 57 at MeaningMonkey.org. atomic number 57 meaning and definition in the English Dictionary. ATOMIC NUMBER 57 nounDefinition of atomic number 57 (noun)a white soft metallic element that tarnishes readily; occurs in rare earth minerals and is usually classified as a rare earthsynonyms: La, lanthanum Source: Princeton University Wordnet
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