gamma ray gamma radiation • gammarid · · · Info · Definitions · Synonyms · Characters · · gamma ray · · Text Common · · Latin · · Scripts 9 · · Length 3 · · Syllables Definitions · · · (noun) electromagnetic radiation emitted during radioactive decay and having an extremely short wavelength. Synonyms: gamma radiation, gamma ray. · · Noun Definition 1 Synonyms · · · gamma radiation · · Synonym 1 Characters · · space U+0020 a latin small letter a U+0061 g latin small letter g U+0067 m latin small letter m U+006D r latin small letter r U+0072 y latin small letter y U+0079