[ nal-trek-sohn ]
/ nælˈtrɛk soʊn /

noun Pharmacology.

a nonaddictive substance, C20H23NO4, used in the treatment of heroin addiction and opiate overdose.

Origin of naltrexone

First recorded in 1970–75; by rearrangement of parts of its chemical name Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Examples from the Web for naltrexone

British Dictionary definitions for naltrexone

/ (nælˈtrɛksəʊn) /


a narcotic antagonist, similar to morphine, used chiefly in the treatment of heroin addiction

Word Origin for naltrexone

C20: from N-al (lylnor) ox (ymorph) one, + the arbitrary insertion of -trex-
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

Medical definitions for naltrexone

[ năl-trĕksōn ]


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.