noun
[ U ] ( chemistry ) a brown poisonous gas. Nitrogen dioxide is formed when some metals are dissolved in nitric acid .
noun
[ U ] ( chemistry ) a brown poisonous gas. Nitrogen dioxide is formed when some metals are dissolved in nitric acid .
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005