mass deficiency mass defect • masse · · · Info · Definitions · Synonyms · Characters · · mass deficiency · · Text Common · · Latin · · Scripts 15 · · Length 5 · · Syllables Definitions · · · (noun) the amount by which the mass of an atomic nucleus is less than the sum of the masses of its constituent particles. Synonyms: mass defect, mass deficiency. · · Noun Definition 1 Synonyms · · · mass defect · · Synonym 1 Characters · · space U+0020 a latin small letter a U+0061 c latin small letter c U+0063 d latin small letter d U+0064 e latin small letter e U+0065 f latin small letter f U+0066 i latin small letter i U+0069 m latin small letter m U+006D n latin small letter n U+006E s latin small letter s U+0073 y latin small letter y U+0079