laughing gas laughing • laughing gull · · · Info · Definitions · Synonyms · Characters · · laughing gas · · Text Common · · Latin · · Scripts 12 · · Length 4 · · Syllables Definitions · · · (noun) inhalation anesthetic used as an anesthetic in dentistry and surgery. Synonyms: nitrous oxide, laughing gas. · · Noun Definition 1 Synonyms · · · nitrous oxide · · Synonym 1 Characters · · space U+0020 a latin small letter a U+0061 g latin small letter g U+0067 h latin small letter h U+0068 i latin small letter i U+0069 l latin small letter l U+006C n latin small letter n U+006E s latin small letter s U+0073 u latin small letter u U+0075