Where does “vatsakatkero” come from?

vatsakatkero (Finnish) comes from Finnish katkero, from Finnish katkera, from Proto-Finnic kackera, from Proto-Finno-Ugric *kačka-.

Ancestry of “vatsakatkero”, step by step

vatsakatkero traces back through two separate lines of ancestry.

via Finnish katkero

StepLanguageWordMeaning
1Finnishkatkerobitters; gentian
2Finnishkatkerabitter, resentful
3Proto-Finnickackerabitter
4Proto-Finno-Ugric*kačka-—

via Finnish vatsa

StepLanguageWordMeaning
1Finnishvatsastomach
2Proto-Finnicvaccastomach
Every word from Proto-Finno-Ugric *kačka- →Every word from Proto-Finnic kackera →Every word from Finnish katkera →