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- (chemistry) the binary compound of nitrogen and oxygen NO; an unstable compound which rapidly oxidizes in the presence of air.
- 2019, Bill Bryson, The Body: A Guide for Occupants, Black Swan (2020), pages 156-157:
- In fact, nitric oxide (not to be confused with nitrous oxide, or laughing gas) is one of our primary signalling molecules.
binary compound of nitrogen and oxygen