Where does “voso” come from?

voso (Galician) comes from Old Portuguese vosso, from Latin vossus, from Latin voster, from Latin vester, from Proto-Italic westeros, from Proto-Indo-European -teros — Contrastive or oppositional adjectival suffix.

voso (Galician): yours

Definitions

yours

Ancestry of “voso”, step by step

Step	Language	Word	Meaning
1	Old Portuguese	vosso	—
2	Latin	vossus	—
3	Latin	voster	Alternative form of vester; your, plural...
4	Latin	vester	your, yours, of you
5	Proto-Italic	westeros	your
6	Proto-Indo-European	-teros	Contrastive or oppositional adjectival suffix

Every word from Proto-Indo-European -teros →Every word from Proto-Italic westeros →Every word from Latin vester →