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trademark name, by 1942; originally a morphine substitute.
Demerol Dem·er·ol (děm'ə-rôl', -rŏl', -rōl')
A trademark used for a medicinal preparation of meperidine.
synthetic drug used in the treatment of moderate to severe pain. It is an opioid analgesic, and thus its effects on the body resemble those of opium or morphine, one of opium's purified constituents. A common trade name for meperidine is Demerol.