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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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  1. a gas used especially in the past by dentists to prevent you from feeling pain
See nitrous oxide in the Oxford Advanced American Dictionary
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