Where does “būlō” come from?

būlō (Proto-Germanic) comes from Proto-Indo-European bʰel-, from Proto-Indo-European bʰōl-.

būlō (Proto-Germanic): boil; sore

Definitions

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

būlō — Etymology, Origin & Word History | Etymology Explorer