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Definition of laughing gas noun from the Oxford Advanced Learner's Dictionary

laughing gas

noun

/ˈlɑːfɪŋ ɡæs/

/ˈlæfɪŋ ɡæs/

[uncountable] (informal)

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nitrous oxide (= a gas used especially in the past by dentists to prevent you from feeling pain)

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See laughing gas in the Oxford Advanced American Dictionary

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laughing gas

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noun

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C1

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