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  1. Oxford American Dictionary

    nitrogen dioxide

    • IPA[ˈnītrəjən dīˈäkˌsīd]

    美式

    • n.
      a reddish-brown poisonous gas occurring commonly as an air pollutant, formed by the oxidation of nitric oxide or by combustion in the presence of air. Below 70°F (21°C), nitrogen dioxide is a yellowish-brown liquid.

    • noun: nitrogen dioxide