/ ˌnaɪtrəs ˈɒksaɪd; NAmE ˈɑːk-/ (also informal ˈlaughing gas ) noun
[ U ] a gas used especially in the past by dentists to prevent you from feeling pain
/ ˌnaɪtrəs ˈɒksaɪd; NAmE ˈɑːk-/ (also informal ˈlaughing gas ) noun
[ U ] a gas used especially in the past by dentists to prevent you from feeling pain
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005