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Definitions mass number noun  (physics) The total number of protons and neutrons in an atomic nucleus. Translations:  Supplemental Details:Sponsor an extended definition for mass number for as little as $10 per month. Click here to contact us.        Find:   Words Starting With:   Words Ending With:   Words Containing:   Words That Match:    Translate Into:    Dutch   French   German    Italian   Spanish     Show 51015202550100250500 results per page. Browse the Dictionary A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

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