soporific

[sop-uh-rif-ik, soh-puh-]
adjective
1.
causing or tending to cause sleep.
2.
pertaining to or characterized by sleep or sleepiness; sleepy; drowsy.
noun
3.
something that causes sleep, as a medicine or drug.

Origin:
1655–65; < Latin sopor sopor + -i- + -fic; compare French soporifique

soporifically, adverb
antisoporific, adjective, noun
nonsoporific, adjective, noun
unsoporific, adjective
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World English Dictionary
soporific (ˌsɒpəˈrɪfɪk)
 
adj
1.  inducing sleep
2.  drowsy; sleepy
 
n
3.  a drug or other agent that induces sleep
 
sopo'rifically
 
adv

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Etymonline
Word Origin & History

soporific
1690, from Fr. soporifique (1687), formed in Fr. from L. sopor (gen. soporis) "deep sleep," from a causative form of the PIE base *swep- "to sleep" (see somnolence).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

soporific sop·o·rif·ic (sŏp'ə-rĭf'ĭk, sō'pə-)
adj.

  1. Inducing or tending to induce sleep.

  2. Sleepy; drowsy.

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
TV is a great soporific, often much needed as an escape, but it isn't good for
  you.
One stage for heated battles is the otherwise peaceful, if often soporific,
  college faculty meeting.
To escape the soporific effects of the heat the seminarians work in
  subterranean libraries.
The offerings include one soporific clunker, one engaging thrill-ride, and one
  terrific biopic.
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