opioid

[oh-pee-oid]
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:
1955–60; opi(um) + -oid

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Collins
World English Dictionary
opioid (ˈəʊpɪˌɔɪd)
 
n
a.  any of a group of substances that resemble morphine in their physiological or pharmacological effects, esp in their pain-relieving properties
 b.  (modifier) of or relating to such substances: opioid receptor; opioid analgesic

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

opioid
1957, from opium + -oid.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

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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Example sentences
Heroin mimics a group of molecules called endogenous opioids.
The reason is almost certainly the effects of endogenous opioids, better known
  as endorphins.
Finally, opioids can be considered, but they are not a cure.
Researchers have shown that placebos can activate the body's own painkilling
  opioids.
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