English dictionary atomic number 39 meaning and definition Definition and meaning of atomic number 39 at MeaningMonkey.org. atomic number 39 meaning and definition in the English Dictionary. ATOMIC NUMBER 39 nounDefinition of atomic number 39 (noun)a silvery metallic element that is common in rare-earth minerals; used in magnesium and aluminum alloyssynonyms: Y, yttrium Source: Princeton University Wordnet
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