relaxer

1. Now remember, you were given powerful pain medications and a muscle relaxer. So, uh, dont operate heavy machinery.
   记住，你刚吃了强力止痛药还有肌肉松弛剂，所以千万别去操作重型机械。
2. I'm going to buy some relaxer for my hair.
   我要买些顺发剂来弄我的头发。

noun

1. any agent that produces relaxation
   1. music is a good relaxer