Trends in Opioid Analgesic Abuse and Mortality in the United States — NEJM
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opioid
/opi·oid/ (o´pe-oid)
1. any synthetic narcotic that has opiate-like activities but is not derived from opium.
2. any of a group of naturally occurring peptides, e.g., enkephalins, that bind at or otherwiseinfluence opiate receptors, either with opiate-like or opiate antagonist effects.