Where does “pikkurousku” come from?

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

pikkurousku (Finnish): birch milk-cap, "Lactarius tabidus"

Definitions

  1. birch milk-cap, "Lactarius tabidus"

Ancestry of “pikkurousku”, step by step

pikkurousku 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 pikku

StepLanguageWordMeaning
1Finnishpikkulittle, small; little old
2Finnishpienilittle, small; Third-person singular indicative...
3Proto-Finnicpeenilittle, small; fine
Every word from Proto-Finnic -uEvery word from Finnish -uEvery word from Finnish rousku