Where does “sopiturus” come from?

sopiturus (Latin) comes from Latin sopio, from Proto-Indo-European swep- — to sleep.

Definitions

Step	Language	Word	Meaning
1	Latin	sopio	I deprive of feeling; I lull to sleep, put to...
2	Proto-Indo-European	swep-	to sleep

sopiturus — Etymology, Origin & Word History | Etymology Explorer