Nitrogen-dioxide meaning

A deadly poisonous reddish brown gas, NO2 , denser than air, often found in smog and automobile exhaust fumes and synthesized for use as a nitrating agent, a catalyst, and an oxidizing agent.
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A poisonous, reddish-brown gas, NO2, used in making nitric acid, as a rocket-fuel oxidizer, etc.: it is also an air pollutant formed from automobile exhausts.
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(inorganic chemistry) The binary compound NO2, a brownish gas that is a poisonous air pollutant; it exists in equilibrium with dinitrogen tetroxide.
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