alpha decay alpha crucis • alpha-eucaine · · · Info · Definitions · Characters · · alpha decay · · Text Common · · Latin · · Scripts 11 · · Length 4 · · Syllables Definitions · · · (noun) radioactive decay of an atomic nucleus that is accompanied by the emission of an alpha particle. Synonyms: alpha decay. · · Noun Definition 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 h latin small letter h U+0068 l latin small letter l U+006C p latin small letter p U+0070 y latin small letter y U+0079