Where does “λούζω” come from?

λούζω (Byzantine Greek) comes from Ancient Greek λούω, from Proto-Indo-European lewh₃- — to wash.

Ancestry of “λούζω”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	λούω	to wash, bathe; to purify, cleanse; to bathe...
2	Proto-Indo-European	lewh₃-	to wash