English

Definition of nitrogen dioxide noun from the Oxford Advanced Learner's Dictionary

 

nitrogen dioxide

 noun
noun
BrE BrE//ˌnaɪtrədʒən daɪˈɒksaɪd//
 
; NAmE NAmE//ˌnaɪtrədʒən daɪˈɑːksaɪd//
 
[uncountable] (chemistry)
 
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a brown poisonous gas. Nitrogen dioxide is formed when some metals are dissolved in nitric acid.
See the Oxford Advanced American Dictionary entry: nitrogen dioxide