SOPORIF'EROUS, adjective [Latin soporifer; sopor, asleep, and fero, to bring; from sopio, to lull to sleep.] Causing sleep, or tending to produce it; narcotic; opiate; anodyne; somniferous. The poppy pssesses soporiferous qualities.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI