English dictionary atomic number 77 meaning and definition Definition and meaning of atomic number 77 at MeaningMonkey.org. atomic number 77 meaning and definition in the English Dictionary. ATOMIC NUMBER 77 nounDefinition of atomic number 77 (noun)a heavy brittle metallic element of the platinum group; used in alloys; occurs in natural alloys with platinum or osmiumsynonyms: Ir, iridium Source: Princeton University Wordnet
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