Origin of somnifacient
Latin somnus sleep + English -facient
First Known Use: circa 1890
Medical Definition of somnifacient
: a somnifacient agent (as a drug) : hypnotic 1
Learn More about somnifacient
Medical Dictionary: Definition of "somnifacient"
Seen and Heard
What made you want to look up somnifacient? Please tell us where you read or heard it (including the quote, if possible).