Where does “fustaneum” come from?

fustaneum (Medieval Latin) comes from Latin fustis, from Proto-Indo-European gʷʰen-, from Proto-Indo-European bʰon-.

Ancestry of “fustaneum”, step by step

Step	Language	Word	Meaning
1	Latin	fustis	a knobbed stick, a cudgel, staff, club
2	Proto-Indo-European	gʷʰen-	to strike, slay, kill
3	Proto-Indo-European	bʰon-	—

fustaneum — Etymology, Origin & Word History | Etymology Explorer