nal·trex·one

[nal-trek-sohn]
noun Pharmacology.
a nonaddictive substance, C 2 0 H 2 3 NO 4 , used in the treatment of heroin addiction and opiate overdose.

Origin:
1970–75; by rearrangement of parts of its chemical name

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Collins
World English Dictionary
naltrexone (nælˈtrɛksəʊn) [Click for IPA pronunciation guide]
 
n
a narcotic antagonist, similar to morphine, used chiefly in the treatment of heroin addiction
 
[C20: from N-al(lylnor)ox(ymorph)one, + the arbitrary insertion of -trex-]

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00:10
Naltrexone is always a great word to know.
So is slumgullion. Does it mean:
a chattering or flighty, light-headed person.
a stew of meat, vegetables, potatoes, etc.
American Heritage
Medical Dictionary

naltrexone nal·trex·one (nāl-trěk'sōn)
n.
An endorphin and narcotic antagonist. It is devoid of pharmacologic action when administered in the absence of narcotics.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Inadvertent injection of naltrexone suspension into fatty tissue may increase
  the likelihood of serious injection site reactions.
Naltrexone for the management of alcohol dependence.
They then studied images of the rats' brains to see how naltrexone affected
  brain activity.
Provides concise guidelines for primary health care providers on naltrexone
  therapy for alcoholism treatment.
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