Where does “pesukarttu” come from?

pesukarttu (Finnish) comes from Finnish pesu, from Finnish -u, from Proto-Finnic -u — Forms nouns from adjectives, nouns.

Ancestry of “pesukarttu”, step by step

pesukarttu traces back through two separate lines of ancestry.

via Finnish pesu

StepLanguageWordMeaning
1Finnishpesuwash, washing
2Finnish-uForms nouns from verbs. Most common with "e"- and...
3Proto-Finnic-uForms nouns from adjectives, nouns

via Finnish karttu

StepLanguageWordMeaning
1FinnishkarttuA slender log used as a hitting implement
Every word from Proto-Finnic -uEvery word from Finnish -uEvery word from Finnish pesu
pesukarttu — Etymology, Origin & Word History | Etymology Explorer