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

nitrogen dioxide

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