Where does “sous-espace” come from?

sous-espace (French) comes from French sous-, from Old French sus-, from Latin sub, from Proto-Italic supo, from Proto-Indo-European upó, from Proto-Indo-European h₃ewp-.

sous-espace (French): subspace

Definitions

subspace

Ancestry of “sous-espace”, step by step

Step	Language	Word	Meaning
1	French	sous-	sub-; under-
2	Old French	sus-	—
3	Latin	sub	under, beneath; behind; at the feet of
4	Proto-Italic	supo	under
5	Proto-Indo-European	upó	under, below
6	Proto-Indo-European	h₃ewp-	—

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