Wiktionary
n. (context inorganic compound English) the binary compound NO2, a brownish gas that is a poisonous air pollutant; it exists in equilibrium with dinitrogen tetroxide.
WordNet
n. a highly poisonous brown gas (NO2)
Wikipedia
Nitrogen dioxide is the chemical compound with the formula . It is one of several nitrogen oxides. is an intermediate in the industrial synthesis of nitric acid, millions of tons of which are produced each year. At higher temperatures it is a reddish-brown gas that has a characteristic sharp, biting odor and is a prominent air pollutant. Nitrogen dioxide is a paramagnetic, bent molecule with C point group symmetry.
Usage examples of "nitrogen dioxide".
A lot of nitrogen would be burned, into nitrogen dioxide, nitric acid.
Near the sun the sky is like fresh blood, tinged by nitrogen dioxide.
Thousands of tons of breathing-air are all about me, tied up in nitrogen dioxide, N02.
Thousands of tons of breathing-air are all about me, tied up in nitrogen dioxide, NO(subtext)2.
Unsaturated hydrocarbons, ozone, nitrogen dioxide, formaldehyde, acetone.