Where does “*dʰṛ-to-” come from?

*dʰṛ-to- (Proto-Indo-European) comes from Proto-Indo-European dʰreyd- — to have diarrhea.

Ancestry of “*dʰṛ-to-”, step by step

Step	Language	Word	Meaning
1	Proto-Indo-European	dʰreyd-	to have diarrhea

*dʰṛ-to- — Etymology, Origin & Word History | Etymology Explorer