Definition of nitric oxide in US English:

nitric oxide


  • A colorless toxic gas formed in many reactions in which nitric acid is reduced, as in reaction with copper. It reacts immediately with oxygen to form nitrogen dioxide.

    Chemical formula: NO. Also called nitrogen monoxide

    • ‘In these reactions the ozone reacts with nitric oxide to produce nitrogen dioxide.’
    • ‘Levels of nitric oxide, nitrogen dioxide and sulphur dioxide remained at a normally low level.’
    • ‘He isolated around twenty different airs, including hydrogen chloride, nitric oxide, and ammonia.’
    • ‘Also, nitric oxide synthase will produce superoxide in lieu of nitric oxide when arginine concentration is low.’
    • ‘Both nitric oxide and nitrogen dioxide can be toxic at higher concentrations.’


nitric oxide

/ˈˌnītrik ˈäkˌsīd/