Where does “λωρίον” come from?

λωρίον (Koine Greek) comes from Ancient Greek λῶρος, from Latin lorum, from Proto-Indo-European wēl-.

Ancestry of “λωρίον”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	λῶρος	lorum, thong
2	Latin	lorum	thong; reins of a bridle; whip, lash, scourge
3	Proto-Indo-European	wēl-	—