Where does “vomitorium” come from?

vomitorium (Latin) comes from Latin vomitōrius, from Latin vomō, from Proto-Indo-European wemh₁- — to spew, to vomit.

Ancestry of “vomitorium”, step by step

Step	Language	Word	Meaning
1	Latin	vomitōrius	—
2	Latin	vomō	—
3	Proto-Indo-European	wemh₁-	to spew, to vomit

vomitorium — Etymology, Origin & Word History | Etymology Explorer