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氧化亚氮，笑气（旧时牙医用作麻醉剂）