Where does “rojaus” come from?

rojaus (Finnish) comes from Finnish -us, from Proto-Finnic -us — Forms some nouns from nominal stems.

Ancestry of “rojaus”, step by step

StepLanguageWordMeaning
1Finnish-usForms nouns from verbs, describing an action or...
2Proto-Finnic-usForms some nouns from nominal stems
Every word from Proto-Finnic -us →Every word from Finnish -us →