English dictionary atomic number 25 meaning and definition Definition and meaning of atomic number 25 at MeaningMonkey.org. atomic number 25 meaning and definition in the English Dictionary. ATOMIC NUMBER 25 nounDefinition of atomic number 25 (noun)a hard brittle grey polyvalent metallic element that resembles iron but is not magnetic; used in making steel; occurs in many mineralssynonyms: manganese, Mn Source: Princeton University Wordnet
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