o·pi·ate

[n., adj. oh-pee-it, -eyt; v. oh-pee-eyt] noun, adjective, verb, o·pi·at·ed, o·pi·at·ing.
noun
1.
a drug containing opium or its derivatives, used in medicine for inducing sleep and relieving pain.
2.
any sedative, soporific, or narcotic.
3.
anything that causes dullness or inaction or that soothes the feelings.
adjective
4.
mixed or prepared with opium.
5.
inducing sleep; soporific; narcotic.
6.
causing dullness or inaction.
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verb (used with object)
7.
to subject to an opiate; stupefy.
8.
to dull or deaden.
Origin:
1535–45; < Medieval Latin opiātus bringing sleep, equivalent to Latin opi(um) opium + -ātus -ate1

Related forms
un·o·pi·at·ed, adjective

Synonyms
2. drug. 3. anodyne. 5. sedative.

Antonyms
2. stimulant.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source Link To opiate
Collins
World English Dictionary
opiate
 
—n
1.  any of various narcotic drugs, such as morphine and heroin, that act on opioid receptors
2.  any other narcotic or sedative drug
3.  something that soothes, deadens, or induces sleep
 
—adj
4.  containing or consisting of opium
5.  inducing relaxation; soporific
 
—vb
6.  to treat with an opiate
7.  to dull or deaden
 
[C16: from Medieval Latin opiātus; from Latin opium poppy juice, opium]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

opiate
1540s (adj.) "made with or containing opium," from M.L. opiatus, from L. opium (see opium). The noun is attested from c.1600; fig. sense of "anything that dulls the feelings" is from 1640s.
Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
American Heritage
Medical Dictionary

opiate o·pi·ate (ō'pē-ĭt, -āt')
n.

  1. Any of various sedative narcotics that contain opium or one or more of its natural or synthetic derivatives.

  2. A drug, hormone, or other chemical substance that has sedative or narcotic effects similar to those containing opium or its derivatives. Also called opioid.

adj.

  1. Of or containing opium or any of its derivatives.

  2. Resembling opium or its derivatives in activity.

  3. Inducing sleep or sedation; soporific.

v. o·pi·at·ed, o·pi·at·ing, o·pi·ates (-āt')
To subject to the action of an opiate.
o'pi·ate (-ĭt, -āt') 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
Doctors tried unsuccessfully to revive him with naloxone, a drug used to treat
  opiate overdoses.
Its derivative, heroin, is the main opiate of addiction and there are several
  ways in which that drug can be taken.
Pain is the body's way of saying you've gone too far, and opiate addiction's a
  nasty thing.
Claims to be able to reliably differentiate between opiate and poppy seed use.
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