NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 8,201 terms related to cancer and medicine.

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opioid
(OH-pee-OYD)
A substance used to treat moderate to severe pain. Opioids are like opiates, such as morphine and codeine, but are not made from opium. Opioids bind to opioid receptors in the central nervous system. Opioids used to be called narcotics. An opioid is a type of alkaloid.