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].

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