outer planet outerness • outer space · · · Info · Definitions · Characters · · outer planet · · Text Common · · Latin · · Scripts 12 · · Length 4 · · Syllables Definitions · · · (noun) (astronomy) a major planet whose orbit is outside the asteroid belt (Jupiter, Saturn, Uranus, Neptune, Pluto). Synonyms: outer planet. · · Noun Definition 1 Characters · · space U+0020 a latin small letter a U+0061 e latin small letter e U+0065 l latin small letter l U+006C n latin small letter n U+006E o latin small letter o U+006F p latin small letter p U+0070 r latin small letter r U+0072 t latin small letter t U+0074 u latin small letter u U+0075