Where does “rutarousku” come from?

rutarousku (Finnish) comes from Finnish rousku, from Finnish -u, from Proto-Finnic -u — Forms nouns from adjectives, nouns.

rutarousku (Finnish): A milk-cap, Lactarius lacunarum

Definitions

  1. A milk-cap, Lactarius lacunarum

Ancestry of “rutarousku”, step by step

rutarousku traces back through two separate lines of ancestry.

via Finnish rousku

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

via Finnish ruta

StepLanguageWordMeaning
1Finnishrutamud
Every word from Proto-Finnic -u →Every word from Finnish -u →Every word from Finnish rousku →