Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun nitrogen_oxide

1 sense of nitrogen oxide

Sense 1
nitrogen oxide -- (any of several oxides of nitrogen formed by the action of nitric acid on oxidizable materials; present in car exhausts)
       => oxide -- (any compound of oxygen with another element or a radical)
       => pollutant -- (waste matter that contaminates the water or air or soil)