English dictionary atomic number 73 meaning and definition Definition and meaning of atomic number 73 at MeaningMonkey.org. atomic number 73 meaning and definition in the English Dictionary. ATOMIC NUMBER 73 nounDefinition of atomic number 73 (noun)a hard grey lustrous metallic element that is highly resistant to corrosion; occurs in niobite and fergusonite and tantalitesynonyms: Ta, tantalum Source: Princeton University Wordnet
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