English dictionary atomic number 58 meaning and definition Definition and meaning of atomic number 58 at MeaningMonkey.org. atomic number 58 meaning and definition in the English Dictionary. ATOMIC NUMBER 58 nounDefinition of atomic number 58 (noun)a ductile grey metallic element of the lanthanide series; used in lighter flints; the most abundant of the rare-earth groupsynonyms: Ce, cerium Source: Princeton University Wordnet
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