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English definition of “nitrous oxide”

nitrous oxide

noun [U] uk   /ˌnaɪ.trəsˈɒk.saɪd/ us    /-ˈɑːk-/ (informal laughing gas) specialized
a type of gas with a sweet smell that is used as a weak anaesthetic (= substance that stops pain), especially by dentistsChemical elements
(Definition of nitrous oxide from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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