Where does “ধোয়া” come from?

ধোয়া (Bengali) comes from Sanskrit धाव, from Proto-Indo-Aryan *dʰā́w-.

ধোয়া (Bengali): to wash

Definitions

Step	Language	Word	Meaning
1	Sanskrit	धाव	—
2	Proto-Indo-Aryan	*dʰā́w-	—

ধোয়া — Etymology, Origin & Word History | Etymology Explorer