Where does “lavandaio” come from?

lavandaio (Italian) comes from Latin lavandārius, from Latin lavāre, from Proto-Indo-European lewh₃- — to wash.

lavandaio (Italian): washer, laundryman

Definitions

Step	Language	Word	Meaning
1	Latin	lavandārius	—
2	Latin	lavāre	—
3	Proto-Indo-European	lewh₃-	to wash

lavandaio — Etymology, Origin & Word History | Etymology Explorer