- nitrogen oxide
- nounany of several oxides of nitrogen formed by the action of nitric acid on oxidizable materials; present in car exhausts (Freq. 1)
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noun: any of several oxides of nitrogen some of which are formed in a mixture as toxic fumes by the action of nitric acid on oxidizable material (as organic substances or metals) or by the decomposition of nitrates or nitro compounds and are used as catalysts in the chamber process of making sulfuric acid: asa. : nitrous oxideb. : nitric oxidec. : nitrogen trioxided. : nitrogen dioxidee. : nitrogen pentoxide* * *
nitrogen oxide,any one of the various oxides of nitrogen, often in the form of a colorless, poisonous gas such as nitric oxide: »Nitrogen oxides…have been blamed for contributing to smog conditions in auto-packed Los Angeles (Science News Letter).
Useful english dictionary. 2012.