nitrous oxide
noun
mass noun
1- Chemistry a colourless gas with a sweetish odour, prepared by heating ammonium nitrate. It produces exhilaration or anaesthesia when inhaled and is used (mixed with oxygen) as an anaesthetic and as an aerosol propellant.【化】一氧化二氮, 氧化亚氮, 笑气。
1.1
- Chem. formula: N2O.化学分子式：N2O.