| NOUN | substance | nitrogen oxide | any of several oxides of nitrogen formed by the action of nitric acid on oxidizable materials |
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| Meaning | Any of several oxides of nitrogen formed by the action of nitric acid on oxidizable materials; present in car exhausts. | |
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| Broader | oxide | Any compound of oxygen with another element or a radical |
| pollutant | waste matter that contaminates the water or air or soil | |
| Spanish | óxido de nitrógeno | |
| Catalan | òxid de nitrogen | |
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