sedative
/ˈsedətɪv/A sedative is a medicine or drug that calms you or makes you sleep. 镇静剂
noun [物质名词] [药] 镇静剂；能使安静的东西；止痛药
They use opium as a sedative, rather than as a narcotic. 他们把鸦片作为镇静剂，而不是作为麻醉剂。
adjective [原级] 使镇静的；使安静的
It's safe to take a mild sedative. 服用药性不强的镇定剂没有危险。
-sed-
sedative
n. [药] 镇静剂(sed + ative 有…特征的)
