somniferous

[som-nif-er-uhs, suhm-]
adjective
bringing or inducing sleep, as drugs or influences.

Origin:
1595–1605; < Latin somnifer inducing sleep (somni-, combining form of somnus sleep + -fer -fer) + -ous

somniferously, adverb
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World English Dictionary
somniferous or somnific (sɒmˈnɪfərəs)
 
adj
rare tending to induce sleep
 
[C17: from Latin somnifer (from somnus sleep + ferre to do) + -ous]
 
somnific or somnific
 
adj
 
[C17: from Latin somnifer (from somnus sleep + ferre to do) + -ous]
 
som'niferously or somnific
 
adv

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American Heritage
Medical Dictionary

somniferous som·nif·er·ous (sŏm-nĭf'ər-əs)
adj.
Inducing sleep; soporific.

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
It must have been a work of vast ability in the somniferous school of literature.
Somniferous chloroform soothes the nerves, and brings deep sleep upon its subjects.
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