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opioid

[oh-pee-oid] /ˈoʊ piˌɔɪd/
noun, Biochemistry, Pharmacology
1.
any opiumlike substance.
2.
any of a group of natural substances, as the endorphins, produced by the body in increased amounts in response to stress and pain.
3.
any of several synthetic compounds, as methadone, having effects similar to natural opium alkaloids and their derivatives.
adjective
4.
pertaining to such a substance.
Origin of opioid
1955-1960
1955-60; opi(um) + -oid
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for opioid

opioid

/ˈəʊpɪˌɔɪd/
noun
1.
  1. any of a group of substances that resemble morphine in their physiological or pharmacological effects, esp in their pain-relieving properties
  2. (modifier) of or relating to such substances: opioid 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
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Word Origin and History for opioid
n.

1957, from opium + -oid.

Online Etymology Dictionary, © 2010 Douglas Harper
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opioid in Medicine

opioid o·pi·oid (ō'pē-oid')
n.
See opiate. adj.
Opiate.


o'pi·oid' adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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