painkiller

painkiller

[peyn-kil-er]
noun
a drug, treatment, or anything else that relieves pain, especially an analgesic.

Origin:
1850–55, Americanism; pain + killer

painkilling, adjective
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World English Dictionary
painkiller (ˈpeɪnˌkɪlə)
 
n
1.  an analgesic drug or agent
2.  anything that relieves pain

Collins English Dictionary - Complete & Unabridged 10th Edition
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