SOPORIF'IC, adjective [Latin sopor, sleep, and facio, to make.] Causing sleep; tending to cause sleep; narcotic; as the soporific virtues of opium. SOPORIF'IC, noun A medicine, drug, plant or other thing that has the quality of inducing sleep.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI