Where does “undersoil” come from?

undersoil (English) comes from English under, from Middle English under, from Old English under, from Proto-Germanic under, from Proto-Indo-European h₁entér, from Proto-Indo-European h₁en — in; in, inside.

undersoil (English): The soil underneath the surface / topsoil and...

Definitions

  1. The soil underneath the surface / topsoil and...

Ancestry of “undersoil”, step by step

undersoil traces back through two separate lines of ancestry.

via English under

StepLanguageWordMeaning
1EnglishunderIn or at a lower level than; As a subject of;...
2Middle Englishunderunder
3Old Englishunderunder, beneath
4Proto-Germanicunderamong, between; under, beneath; under
5Proto-Indo-Europeanh₁entérbetween
6Proto-Indo-Europeanh₁enin; in, inside

via English soil

StepLanguageWordMeaning
1EnglishsoilA mixture of mineral particles and organic...
2Old Englishsolianto soil; become defiled; make or become foul
3Proto-Germanicsulwōną—
4Proto-Indo-Europeansūl-thick liquid, muck
Every word from Proto-Indo-European h₁en →Every word from Proto-Indo-European h₁entér →Every word from Proto-Germanic under →
undersoil — Etymology, Origin & Word History | Etymology Explorer