Definition of nitrous oxide noun from the Oxford Advanced Learner's Dictionary


nitrous oxide

BrE BrE//ˌnaɪtrəs ˈɒksaɪd//
; NAmE NAmE//ˌnaɪtrəs ˈɑːksaɪd//
(informal laughing gas) [uncountable]
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a gas used especially in the past by dentists to prevent you from feeling pain
See the Oxford Advanced American Dictionary entry: nitrous oxide