[som-nuh-fey-shuh nt]


causing or inducing sleep.


a drug or other agent that induces or tends to induce sleep.

Origin of somnifacient

1885–90; < Latin somn(us) sleep + -i- -i- + -facient Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for somnifacient

Historical Examples of somnifacient

  • The consciousness of having relieved the necessities of others is probably the best appetizer and somnifacient that we have.

    Religion And Health

    James J. Walsh

somnifacient in Medicine




Tending to produce sleep; soporific.
Related formssom′ni•facient n.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.