soporific [sop-uh-rif-ik, soh-puh-]
1. causing or tending to cause sleep.
2. pertaining to or characterized by sleep or sleepiness; sleepy; drowsy.
3. something that causes sleep, as a medicine or drug.
Origin: 1655-65; < Latin sopor sopor + -i- + -fic; compare French soporifique
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