NITROGEN OXIDE as NOUN

1. Meaning
   • any of several oxides of nitrogen formed by the action of nitric acid on oxidizable materials
   • present in car exhausts
   Hypernyms(s) nitrogen oxide is a kind of… Example: animal is a hypernym of mammal, plant is a hypernym of flower
   • oxide (what does oxide mean?)
   • pollutant (what does pollutant mean?)