Of or containing nitrogen with a lower valence, often three.Compare with nitric
- ‘Similar to nitrous acid, nitric oxide gives rise to reactive nitrous anhydride that can induce nitrosative deamination of DNA bases.’
2Of nitrogen; nitrogenous.‘the effect of nitrous emissions on acid rain’
- ‘It was first synthesized in 1776 by Joseph Priestley and was named ‘diminished nitrous air.’’
Early 17th century: from Latin nitrosus ‘nitrous’.
We take a look at several popular, though confusing, punctuation marks.