Where does “kylpyvaahto” come from?

kylpyvaahto (Finnish) comes from Finnish vaahto, from Proto-Finnic vakto, from Proto-Germanic þwahtuz, from Proto-Germanic -þuz, from Proto-Indo-European -tus — Derives action nouns from verb roots.

kylpyvaahto (Finnish): bath foam, bath cream, bubble bath

Definitions

  1. bath foam, bath cream, bubble bath

Ancestry of “kylpyvaahto”, step by step

kylpyvaahto traces back through two separate lines of ancestry.

via Finnish vaahto

StepLanguageWordMeaning
1Finnishvaahtofoam; head; mousse
2Proto-Finnicvaktofoam
3Proto-Germanicþwahtuzwashing, laundry
4Proto-Germanic-þuzForms result nouns from verb roots, usually from...
5Proto-Indo-European-tusDerives action nouns from verb roots

via Finnish kylpy

StepLanguageWordMeaning
1Finnishkylpybath
2Finnish-uForms nouns from verbs. Most common with "e"- and...
3Proto-Finnic-uForms nouns from adjectives, nouns
Every word from Proto-Indo-European -tusEvery word from Proto-Germanic -þuzEvery word from Proto-Germanic þwahtuz