radioactive decay radioactive dating • radioactive dust · · · Info · Definitions · Synonyms · Characters · · radioactive decay · · Text Common · · Latin · · Scripts 17 · · Length 6 · · Syllables Definitions · · · (noun) the spontaneous disintegration of a radioactive substance along with the emission of ionizing radiation. Synonyms: decay, radioactive decay, disintegration. · · Noun Definition 1 Synonyms · · · decay · · Synonym 1 disintegration · · Synonym 2 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 i latin small letter i U+0069 o latin small letter o U+006F r latin small letter r U+0072 t latin small letter t U+0074 v latin small letter v U+0076 y latin small letter y U+0079