any of a class of substances that blunt the senses, as opium, morphine, belladonna, marijuana, 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.
any controlled substance, whether sedative or stimulant: Airports need security solutions that can effectively detect concealed explosives and narcotics.
anything that exercises a soothing or numbing effect or influence: Television is a narcotic for many people.
- nar·cot·i·cal·ly, adverb
- an·ti·nar·cot·ic, adjective, noun
- an·ti·nar·cot·ics, adjective
- non·nar·cot·ic, adjective, noun
- pre·nar·cot·ic, adjective
- pseu·do·nar·cot·ic, adjective, noun
- sem·i·nar·cot·ic, adjective
- sub·nar·cot·ic, adjective
- un·nar·cot·ic, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
British Dictionary definitions for narcotic
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
anything that relieves pain or induces sleep, mental numbness, etc
any illegal drug
of, relating to, or designating narcotics
of or relating to narcotics addicts or users
of or relating to narcosis
- narcotically, adverb
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
Scientific definitions for narcotic
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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.