noun[mass noun] Chemistry
A colourless toxic gas formed in many reactions in which nitric acid is reduced. It reacts immediately with oxygen to form nitrogen dioxide. Also called nitric oxide.
- Chemical formula: NO
- He said burning insulated copper cable, plastics and tyres released into the air poisonous gasses like nitrogen dioxide, nitrogen monoxide and sulphur dioxide.
- The airliner descends on Tehran through a noxious haze of carbon and nitrogen monoxide, ozone, and sulfur.
- He said there would be 42 per cent less nitrogen monoxide, 40 per cent less sulphur dioxide and 26 percent less carbon dioxide.
Definition of nitrogen monoxide in:
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