noun Date: 1869 any of several oxides of nitrogen most of which are produced in combustion and are considered to be atmospheric pollutants: as, nitric oxide , nitrogen dioxide , nitrous oxide
NITROGEN OXIDE
Meaning of NITROGEN OXIDE in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012