Etymology
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methadone (n.)

synthetic analgesic used as a substitute for morphine or heroin in treatment of addiction, 1947, generic designation for 6-dimethylamino-4, 4-diphenyl-3-heptanone. For origins of the syllables, see methyl + amino- + di- + -one.

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Definitions of methadone

methadone (n.)
synthetic narcotic drug similar to morphine but less habit-forming; used in narcotic detoxification and maintenance of heroin addiction;
Synonyms: methadone hydrochloride / methadon / dolophine hydrochloride / fixer / synthetic heroin
From wordnet.princeton.edu