cosmic radiation cosmic microwave background radiation • cosmic ray · · · Info · Definitions · Characters · · cosmic radiation · · Text Common · · Latin · · Scripts 16 · · Length 7 · · Syllables Definitions · · · (noun) radiation coming from outside the solar system. Synonyms: cosmic radiation. · · 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 i latin small letter i U+0069 m latin small letter m U+006D n latin small letter n U+006E o latin small letter o U+006F r latin small letter r U+0072 s latin small letter s U+0073 t latin small letter t U+0074