English dictionary atomic number 51 meaning and definition Definition and meaning of atomic number 51 at MeaningMonkey.org. atomic number 51 meaning and definition in the English Dictionary. ATOMIC NUMBER 51 nounDefinition of atomic number 51 (noun)a metallic element having four allotropic forms; used in a wide variety of alloys; found in stibnitesynonyms: antimony, Sb Source: Princeton University Wordnet
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