Methadone definitions

mĕth'ə-dōn'
A potent synthetic narcotic drug, C21 H27 NO, that is less addictive than morphine or heroin and is used as a substitute for these drugs in addiction treatment programs. It may also be used for chronic pain management.
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A synthetic narcotic drug, C21H27NO, used in medicine to treat heroin and morphine addicts: it is more potent than morphine, with a longer duration of action and milder withdrawal symptoms.
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A potent synthetic narcotic drug, C21 H27 NO, that is less addictive than morphine or heroin and is used as a substitute for these drugs in addiction treatment programs. It may also be used for chronic pain management.
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(chemistry) A synthetic opioid analgesic, used to wean addicts off of heroin or other opiate based narcotics, and in chronic pain management.
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Origin of methadone

Short for methadone hydrochloride (di)meth(yl) a(mino) d(iphenyl) (heptan)one a ketone (heptan(e)) (–one)