opioid
noun/ˈəʊpiɔɪd/
/ˈəʊpiɔɪd/
- any of a class of drugs that are similar to opium in their effects on the human system. Opioids are used in medicines to treat severe pain but some people take them illegally for pleasure and become addicted.
- The study involved patients who had been prescribed opioids for chronic pain.
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opioid