Definitions for "Opioid"
Any synthetic narcotic that has opiate-like activities but is not derived from opium
a scientific term denoting both natural (codeine, morphine) and synthetic (methadone, fentanyl) drugs. A type of medication related to opium. Opioids are strong analgesics.
originally, a term denoting synthetic narcotics resembling opiates, but increasingly used to refer to both opiates and synthetic narcotics