Where does “vesikäärme” come from?
vesikäärme (Finnish) comes from Finnish käärme, from Proto-Finnic kärmeh, from Proto-Finnic kärmeš, from Proto-Balto-Slavic kr̥mis, from Proto-Indo-European kʷŕ̥mis — worm.
vesikäärme (Finnish): Hydra; water snake
Ancestry of “vesikäärme”, step by step