- any opiumlike substance.
- any of a group of natural substances, as the endorphins, produced by the body in increased amounts in response to stress and pain.
- any of several synthetic compounds, as methadone, having effects similar to natural opium alkaloids and their derivatives.
- pertaining to such a substance.
Origin of opioid
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for opioid
In July, the Centers for Disease Control said more specifically that opioid painkillers kill someone every hour.No More Paper Prescriptions: Docs Fight Fraud by Going Electronic
December 18, 2014
With an increase in opioid prescriptions starting in the early 2000s, overdoses in the U.S. began to skyrocket.Is Weed the Secret to Beating Opiate Addiction?
Tracey Mitchell, Abby Haglage
September 5, 2014
Never deny a request for an antibiotic, an opioid pain medication, a scan, or an admission.You Can't Yelp Your Doctor
May 21, 2014
Opioid overdose deaths in America are now greater than heroin and cocaine combined.America’s Oxy-Express Route to Heroin Addiction
May 15, 2014
Once in the system, it binds with opioid receptor cells that send endorphins shooting through the body.Hallucinating Away a Heroin Addiction
May 4, 2014
- any of a group of substances that resemble morphine in their physiological or pharmacological effects, esp in their pain-relieving properties
- (modifier)of or relating to such substancesopioid receptor; opioid analgesic
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
Word Origin and History for opioid
Online Etymology Dictionary, © 2010 Douglas Harper
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.