methadone

[meth-uh-dohn]
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] .


Origin:
1945–50, Americanism; meth(yl) + a(mino) + d(iphenyl) + (heptan)one

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
methadone or methadon (ˈmɛθəˌdəʊn, ˈmɛθəˌdɒn)
 
n
a narcotic analgesic drug similar to morphine, used to treat opiate addiction. Formula: C21H27NO
 
[C20: from (di)meth(yl) + a(mino) + d(iphenyl) + -one]
 
methadon or methadon
 
n
 
[C20: from (di)meth(yl) + a(mino) + d(iphenyl) + -one]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

methadone
1947, generic designation for 6-dimethylamino-4, 4-diphenyl-3-heptanone.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Cultural Dictionary
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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Example sentences
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.
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