Where does “pähkinänrousku” come from?

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

pähkinänrousku (Finnish): A milk-cap, Lactarius pyrogalus

Definitions

  1. A milk-cap, Lactarius pyrogalus

Ancestry of “pähkinänrousku”, step by step

pähkinänrousku 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 pähkinä

StepLanguageWordMeaning
1Finnishpähkinänut; hazel; puzzle, riddle; difficult problem,...
2Proto-Finno-Permicpäškɜ—
Every word from Proto-Finnic -u →Every word from Finnish -u →Every word from Finnish rousku →