any of a class of substances that blunt the senses, as opium, morphine, belladonna, and alcohol, that in large quantities produce euphoria, stupor, or coma, that when used constantly can cause habituation or addiction, and that are used in medicine to relieve pain, cause sedation, and induce sleep.
anything that exercises a soothing or numbing effect or influence: Television is a narcotic for many people.
of or having the power to produce narcosis, as a drug.
pertaining to or of the nature of narcosis.
of or pertaining to narcotics or their use.
used by, or in the treatment of, narcotic addicts.

1350–1400; Middle English narcotik(e) (noun) < Medieval Latin narcōticum < Greek narkōtikón, noun use of neuter of narkōtikós benumbing, equivalent to narkō- (variant stem of narkoûn to benumb; see narco-) + -tikos -tic

narcotically, adverb
antinarcotic, adjective, noun
antinarcotics, adjective
nonnarcotic, adjective, noun
prenarcotic, adjective
pseudonarcotic, adjective, noun
seminarcotic, adjective
subnarcotic, adjective
unnarcotic, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
narcotic (nɑːˈkɒtɪk)
1.  any of a group of drugs, such as heroin, morphine, and pethidine, that produce numbness and stupor. They are used medicinally to relieve pain but are sometimes also taken for their pleasant effects; prolonged use may cause addiction
2.  anything that relieves pain or induces sleep, mental numbness, etc
3.  any illegal drug
4.  of, relating to, or designating narcotics
5.  of or relating to narcotics addicts or users
6.  of or relating to narcosis
[C14: via Medieval Latin from Greek narkōtikós, from narkoūn to render numb, from narkē numbness]

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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Word Origin & History

c.1385, from O.Fr. adj. narcotique (1314), from M.L. narcoticum, from Gk. narkotikon, neut. of narkotikos "making stiff or numb," from narkotos, verbal adj. of narcoun "to benumb, make unconscious," from narke "numbness, stupor, cramp," perhaps from PIE base *(s)nerq- "to turn, twist." Sense of "any
illegal drug" first recorded 1926, Amer.Eng. The adj. is first attested 1601.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

narcotic nar·cot·ic (när-kŏt'ĭk)
A drug derived from opium or opiumlike compounds, with potent analgesic effects associated with significant alteration of mood and behavior, and with the potential for dependence and tolerance following repeated administration. adj.
Capable of inducing a state of stuporous analgesia.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
narcotic   (när-kŏt'ĭk)  Pronunciation Key 
Any of a group of highly addictive analgesic drugs derived from opium or opiumlike compounds. Narcotics can cause drowsiness and significant alterations of mood and behavior.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
He found baggies containing narcotic residue and items of drug paraphernalia with residue on them, according to the warrant.
The towel is then doused with a narcotic scent and hidden inside junk cars or in suitcases rotating on a carousel.
The confiscated narcotic drugs are declared forfeit.
At the time, she was not on narcotic pain medication.
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