nitrous oxide
noun [U] /ˌnaɪ.trəsˈɒk.saɪd/
/-ˈɑːk-/ (informal laughing gas) specializedDefinition
› 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 noun from the Cambridge Advanced Learner's Dictionary & Thesaurus
© Cambridge University Press)
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