nitrogen dioxide nitrogen cycle • nitrogen equilibrium · · · Info · Definitions · Characters · · nitrogen dioxide · · Text Common · · Latin · · Scripts 16 · · Length 5 · · Syllables Definitions · · · (noun) a highly poisonous brown gas (NO2). Synonyms: nitrogen dioxide. · · Noun Definition 1 Characters · · space U+0020 d latin small letter d U+0064 e latin small letter e U+0065 g latin small letter g U+0067 i latin small letter i U+0069 n latin small letter n U+006E o latin small letter o U+006F r latin small letter r U+0072 t latin small letter t U+0074 x latin small letter x U+0078