Definition of nitrous in English:

nitrous

adjective

  • 1Chemistry
    Of or containing nitrogen with a lower valency, 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.’’

Origin

Early 17th century: from Latin nitrosus nitrous.

Pronunciation

nitrous

/ˈnʌɪtrəs/