nitrous oxide
英 [ˌnaɪtrəs ˈɒksaɪd]
美 [ˌnaɪtrəs ˈɑːksaɪd]
n. 氧化亚氮,笑气(旧时牙医用作麻醉剂)
牛津词典
noun
- 氧化亚氮,笑气(旧时牙医用作麻醉剂)
a gas used especially in the past by dentists to prevent you from feeling pain
英英释义
noun
- inhalation anesthetic used as an anesthetic in dentistry and surgery