Where does “pyökinrousku” come from?

pyökinrousku (Finnish) comes from Finnish pyökki, from Old Swedish bōk, from Old Norse bók, from Proto-Germanic bōks, from Proto-Indo-European bʰeh₂ǵos — beech.

pyökinrousku (Finnish): beech milk-cap, Lactarius blennius

Definitions

  1. beech milk-cap, Lactarius blennius

Ancestry of “pyökinrousku”, step by step

pyökinrousku traces back through two separate lines of ancestry.

via Finnish pyökki

StepLanguageWordMeaning
1Finnishpyökkibeech
2Old Swedishbōkbook
3Old Norsebókbeech; textile fabric with figures woven in it;...
4Proto-Germanicbōksletter, written message, inscriptions carved into...
5Proto-Indo-Europeanbʰeh₂ǵosbeech

via Finnish rousku

StepLanguageWordMeaning
1FinnishrouskuA milk-cap
2Finnish-uForms nouns from verbs. Most common with "e"- and...
3Proto-Finnic-uForms nouns from adjectives, nouns
Every word from Proto-Indo-European bʰeh₂ǵosEvery word from Proto-Germanic bōksEvery word from Old Norse bók