painkiller [ˈpeɪnkɪlə(r)]

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n.止痛药

medicine used to reduce or remove physical pain

I shall persuade him to take the painkiller. 我将说服他把止痛药吃下去。
The painkiller only provides him a short respite from his pain. 止痛药仅仅让他在疼痛中有短暂的疏解。