Where does “laihentuminen” come from?

laihentuminen (Finnish) comes from Finnish laihentua, from Finnish laihentaa, from Finnish laiha, from Proto-Finnic laiha, from Proto-Finnic lajša, from Proto-Balto-Slavic laisa-.

Ancestry of “laihentuminen”, step by step

StepLanguageWordMeaning
1Finnishlaihentuato lose weight
2Finnishlaihentaato thin
3Finnishlaihalean; thin; slim
4Proto-Finniclaihalean, thin
5Proto-Finniclajša—
6Proto-Balto-Slaviclaisa-—
Every word from Proto-Balto-Slavic laisa- →Every word from Proto-Finnic lajša →Every word from Proto-Finnic laiha →