neutron star neutron radiation • neutropassive · · · Info · Definitions · Characters · · neutron star · · Text Common · · Latin · · Scripts 12 · · Length 4 · · Syllables Definitions · · · (noun) a star that has collapsed under its own gravity; it is composed of neutrons. Synonyms: neutron star. · · Noun Definition 1 Characters · · space U+0020 a latin small letter a U+0061 e latin small letter e U+0065 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 u latin small letter u U+0075