nitrous oxide noun - Definition, pictures, pronunciation and usage notes | Oxford Advanced American Dictionary at OxfordLearnersDictionaries.com

Definition of nitrous oxide noun from the Oxford Advanced American Dictionary

nitrous oxide

noun

NAmE//ˌnaɪtrəs ˈɑksaɪd//

(informal laughing gas) [uncountable]

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

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