Definition of Soporific:
Also spelled Sophorific [ORWJr].
Hypnotics, Soporifics, and Somnificants (Gr. sleep; L. sopor, heavy sleep, somnus, sleep, + facere, to make) are sedative nervines which produce sleep, leaving undisturbed the normal relationship of the mental faculties to the external world; in a broad sense these include narcotics and anesthetics: chloral hydrate, sulfonmethane, sulfonethylmethane, paraldehyde, chloralformamide, urethane, potassium, sodium, and ammonium bromides [Culbreth1927, p 40].
Substance that induces sleep [Sanchez BOTM680].