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[meth-uh-dohn] /ˈmɛθ əˌdoʊn/
noun, Pharmacology
a synthetic narcotic, C 2 1 H 2 8 ClNO, similar to morphine but effective orally, used in the relief of pain and as a heroin substitute in the treatment of heroin addiction.
Also, methadon
[meth-uh-don] /ˈmɛθ əˌdɒn/ (Show IPA)
Origin of methadone
1945-50, Americanism; meth(yl) + a(mino) + d(iphenyl) + (heptan)one Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for methadone
  • methadone therapy can help opiate-addicted inmates recover, and many countries have embraced it.
  • He admitted to shooting twenty to twenty-five bags a day and said that he was on methadone during the probable-cause hearing.
  • The use of methadone to treat heroin addiction, for example, has met with limited success.
  • methadone is commonly given to people trying to kick a heroin addiction.
  • One aim is to determine whether heroin maintenance is more effective than methadone in helping break addiction.
  • Treatment is available through methadone and even medical prescription of heroin, together with clean needles.
  • People withdrawing from methadone may be placed on long-term maintenance.
  • It showed the presences of both methadone and diazepam.
  • The clinic was stocked with methadone, a drug often used to help treat heroin addicts.
  • methadone is a synthetic opioid that blocks the effects of heroin and other prescription drugs containing opiates.
British Dictionary definitions for methadone


a narcotic analgesic drug similar to morphine, used to treat opiate addiction. Formula: C21H27NO
Word Origin
C20: from (di)meth(yl) + a(mino) + d(iphenyl) + -one
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for methadone

1947, generic designation for 6-dimethylamino-4, 4-diphenyl-3-heptanone. For origins of the syllables, see methyl + amino + di- + -one.

Online Etymology Dictionary, © 2010 Douglas Harper
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methadone in Culture
methadone [(meth-uh-dohn)]

An analgesic that is sometimes used in the treatment of drug addiction.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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