Where does “*petᴰˢ²” come from?

*petᴰˢ² (Proto-Southwestern Tai) comes from Proto-Tai pitᴰ — duck.

Ancestry of “*petᴰˢ²”, step by step

Step	Language	Word	Meaning
1	Proto-Tai	pitᴰ	duck

*petᴰˢ² — Etymology, Origin & Word History | Etymology Explorer