Where does “wiša” come from?

wiša (Proto-Finnic) comes from Proto-Indo-Iranian wišás, from Proto-Indo-European wisós — fluidity, slime, poison; poison; poison; slime;...

Ancestry of “wiša”, step by step

Step	Language	Word	Meaning
1	Proto-Indo-Iranian	wišás	poison, venom
2	Proto-Indo-European	wisós	fluidity, slime, poison; poison; poison; slime;...

wiša — Etymology, Origin & Word History | Etymology Explorer