Where does “flumen” come from?

flumen (Latin) comes from Latin fluō, from Proto-Indo-European bʰléh₁-, from Proto-Indo-European bʰel-, from Proto-Indo-European bʰōl-.

Ancestry of “flumen”, step by step

Step	Language	Word	Meaning
1	Latin	fluō	—
2	Proto-Indo-European	bʰléh₁-	—
3	Proto-Indo-European	bʰel-	to sound; to speak, roar, bark; shiny, white; to...
4	Proto-Indo-European	bʰōl-	—

flumen — Etymology, Origin & Word History | Etymology Explorer