sedative

名词 sedative:

1. a drug that reduces excitability and calms a person
   同义词：sedative drug, depressant, downer

形容词 sedative:

1. tending to soothe or tranquilize
   同义词：ataractic, ataraxic, tranquilizing, tranquilising

1. Any of various sedative narcotics containing opium or one or more of its natural or synthetic derivatives.
   鸦片制剂一种含有镇静性的麻醉剂，含有鸦片或一种或多种自然或人工合成的衍生物
2. I've given him a sedative; that should see him through the night.
   我给了他一片镇静剂，可使他熬过一个夜晚。
3. The doctor gave him a sedative to help him sleep.
   医生给了他镇静剂帮助他入睡。