nitrous oxide Meaning in the Cambridge English Dictionary
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Meaning of “nitrous oxide” in the English Dictionary

"nitrous oxide" in British English

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nitrous oxidenoun [U]

uk   /ˌnaɪ.trəsˈɒk.saɪd/  us   /-ˈɑːk-/ (informal laughing gas) specialized
a ​type of ​gas with a ​sweetsmell that is used as a ​weak anaesthetic (= ​substance that ​stopspain), ​especially by ​dentists
(Definition of nitrous oxide from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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