Tra từ nitrous oxide - Từ điển Oxford Advanced Learner 8th

Từ điển Oxford Advanced Learner 8th

nitrous oxide ni·trous oxide [nitrous oxide] BrE [ˌnaɪtrəs ˈɒksaɪd] NAmE [ˌnaɪtrəs ˈɑːksaɪd] (also informal ˈlaughing gas) noun uncountable a gas used especially in the past by dentists to prevent you from feeling pain See also: ↑laughing gas