Definition of opioid in English:


Pronunciation /ˈōpēˌoid/ /ˈoʊpiˌɔɪd/


  • A compound resembling opium in addictive properties or physiological effects.

    ‘opioids other than heroin’
    • ‘Some of the most addictive pain medications are opioids, a family of drugs that have effects similar to those of opium or morphine.’
    • ‘Some opioids are natural compounds derived from opium, others are synthetic medications that work in a similar way.’
    • ‘Historical evidence suggests that law enforcement has been useful in the control of alcohol, tobacco, amphetamine, and opioids.’
    • ‘Patients with a past or present history of addiction or dependence on opioids account for the majority of these reports.’
    • ‘However, women who are dependent on opioids do better with methadone than with no treatment.’
    • ‘Physicians who were addicted to opioids most commonly used pharmaceutical opioids, with very few using heroin.’


  • Relating to or denoting opioids.

    ‘opioid use’
    • ‘For example, the propensity of opioid abusers entering opioid agonist treatment to discount their cocaine use has been previously documented.’
    • ‘The medications most often implicated in prescription drug abuse are opioid analgesics, sedative-hypnotics and stimulants.’
    • ‘Fentanyl, morphine, and hydromorphone are opioid analgesic medications that may be used for moderate sedation/analgesia.’
    • ‘Nalmefene, another opioid antagonist, is similar to naltrexone but without FDA approval for treatment of alcohol dependence.’
    • ‘An oral, poorly absorbed opioid antagonist, such as naloxone, can be helpful when usual laxatives are not working.’


1950s from opium+ -oid.