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

nitrous oxide

noun

/ˌnaɪtrəs ˈɒksaɪd/

/ˌnaɪtrəs ˈɑːksaɪd/

(also informal laughing gas)

[uncountable]

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a gas used especially in the past by dentists to prevent you from feeling pain

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See nitrous oxide in the Oxford Advanced American Dictionary

Check pronunciation: nitrous oxide

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noun

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