Where does “sottosuolo” come from?

sottosuolo (Italian) comes from Italian sotto-, from Italian sotto, from Latin subtus, from Latin sub, from Proto-Italic supo, from Proto-Indo-European upó, from Proto-Indo-European h₃ewp-.

sottosuolo (Italian): subsoil

Definitions

subsoil

Ancestry of “sottosuolo”, step by step

Step	Language	Word	Meaning
1	Italian	sotto-	sub-; under-
2	Italian	sotto	under, beneath, underneath; below, south of; down
3	Latin	subtus	below, underneath, beneath
4	Latin	sub	under, beneath; behind; at the feet of
5	Proto-Italic	supo	under
6	Proto-Indo-European	upó	under, below
7	Proto-Indo-European	h₃ewp-	—

Every word from Proto-Indo-European h₃ewp- →Every word from Proto-Indo-European upó →Every word from Proto-Italic supo →