Where does “ós” come from?

ós (Galician) comes from Galician os, from Old Portuguese os, from Vulgar Latin *lōs, from Latin illōs, from Latin ille, from Latin olle, from Proto-Italic *olnos — that.

ós (Galician): the

Definitions

Ancestry of “ós”, step by step

ós traces back through two separate lines of ancestry.

via Galician os

Step	Language	Word	Meaning
1	Galician	os	the; accusative of eles
2	Old Portuguese	os	the
3	Vulgar Latin	*lōs	—
4	Latin	illōs	—
5	Latin	ille	that; those; "; demonstrative pronoun "; that...
6	Latin	olle	Archaic form of ille
7	Proto-Italic	*olnos	that

via Galician a

Step	Language	Word	Meaning
1	Galician	a	to, toward; introduces indirect object; used to...
2	Latin	Ad	toward, to
3	Latin	illic	he, she, it, yonder, that, overthere; in that...
4	Latin	-ce	affixed, usually to demonstratives, forming...
5	Proto-Italic	ke	here
6	Indo-European	*ḱe	—

Words derived from “ós”

Every word from Proto-Italic *olnos →Every word from Latin olle →Every word from Latin ille →