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1. any synthetic narcotic that has opiate-like activities but is not derived from opium.
2. denoting naturally occurring peptides, such as enkephalins, that exert opiate-like effects by interacting with opiate receptors of cell membranes. See also opioid analgesic.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.
Originally, a term denoting synthetic narcotics resembling opiates but increasingly used to refer to both opiates and synthetic narcotics.
Farlex Partner Medical Dictionary © Farlex 2012
Any of various compounds that bind to specific receptors in the central nervous system and have analgesic and narcotic effects, including naturally occurring substances such as morphine; synthetic and semisynthetic drugs such as methadone and oxycodone; and certain peptides produced by the body, such as endorphins. Also called opiate.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
opioidadjective Referring to opium-like activity, especially on receptors.
(1) A drug that has narcotic effects similar to opium (Papaver somniferum) but is not derived from it.
(2) An endogenous peptide (e.g., endorphin) that acts on opioid receptors.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.
opioidNeurology A pain-attenuating peptide that occurs naturally in the brain, which induces analgesia by mimicking endogenous opioids at opioid receptors in the brain. See Opioid-mediated analgesia system.
Agonists The most potent opioid agonists are morphine, meperidine, methadone; other opioids include hydromorphine–Dilaudid®, codeine, oxycodone–Percodan®, propoxyphene–Darvon®
Mixed agonsts-antagonists Pentazocine–Talwin®
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.
A narcotic substance, either natural or synthetic.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
Any morphine-like synthetic narcotic that produces the same effects as drugs derived from the opium poppy (opiates), such as pain relief, sedation, constipation and respiratory depression.
Mentioned in: Anesthesia, General
Gale Encyclopedia of Medicine. Copyright 2008 The Gale Group, Inc. All rights reserved.
Originally, synthetic narcotics resembling opiates but increasingly used to refer to both opiates and synthetic narcotics.
Medical Dictionary for the Dental Professions © Farlex 2012