noble gas noble-fronted • noblehearted · · · Info · Definitions · Synonyms · Characters · · noble gas · · Text Common · · Latin · · Scripts 9 · · Length 3 · · Syllables Definitions · · · (noun) any of the chemically inert gaseous elements of the helium group in the periodic table. Synonyms: noble gas, inert gas, argonon. · · Noun Definition 1 Synonyms · · · inert gas · · Synonym 1 argonon · · Synonym 2 Characters · · space U+0020 a latin small letter a U+0061 b latin small letter b U+0062 e latin small letter e U+0065 g latin small letter g U+0067 l latin small letter l U+006C n latin small letter n U+006E o latin small letter o U+006F s latin small letter s U+0073