Where does “lapinrousku” come from?

lapinrousku (Finnish) comes from Finnish lappi, from Swedish läpp, from Old Swedish lapper, from Finnish lappalainen, from Finnish -läinen, from Finnish laji, from Old Swedish slagh, from Middle Low German slach — to hit.

lapinrousku (Finnish): A milk-cap, "Lactarius lapponicus"

Definitions

  1. A milk-cap, "Lactarius lapponicus"

Ancestry of “lapinrousku”, step by step

lapinrousku traces back through two separate lines of ancestry.

via Finnish lappi

StepLanguageWordMeaning
1FinnishlappiThe Sami language, Lappish; A Sami person
2Swedishläpplip
3Old Swedishlapper—
4FinnishlappalainenA Sami
5Finnish-läinenFront vowel variant of -lainen
6Finnishlajikind, sort; species; sport
7Old Swedishslagh—
8Middle Low Germanslach—
9Old Saxonslag—
10Proto-West Germanicslagiblow, strike
11Swedishslaggslag metallurgical waste material
12Low Germanslagge—
13Middle Low Germanslagge—
14Middle Low Germanslānto hit, strike
15Old Saxonslāhanto hit

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 Old Saxon slāhan →Every word from Middle Low German slān →Every word from Middle Low German slagge →