Definition of “nitrogen dioxide” - English Dictionary

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“nitrogen dioxide” in British English

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nitrogen dioxidenoun [ U ]

uk /ˌnaɪ.trə.dʒən daɪˈɒk.saɪd/ us /ˌnaɪ.trə.dʒən daɪˈɑːk.saɪd/ specialized

a poisonous brown gas, formed when some metals dissolve in nitric acid

(Definition of “nitrogen dioxide” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)