Where does “interior” come from?

interior (Spanish) comes from Latin interior, from Latin interus, from Proto-Indo-European h₁énteros, from Proto-Indo-European -teros — Contrastive or oppositional adjectival suffix.

interior (Spanish): inner, interior; interior; male underwear,...

Definitions

inner, interior; interior; male underwear,...

Ancestry of “interior”, step by step

Step	Language	Word	Meaning
1	Latin	interior	inner, interior; nearer
2	Latin	interus	—
3	Proto-Indo-European	h₁énteros	inside, within
4	Proto-Indo-European	-teros	Contrastive or oppositional adjectival suffix

Words derived from “interior”

interioridad
interiorizar
interiormente
interyor
interyor

Every word from Proto-Indo-European -teros →Every word from Proto-Indo-European h₁énteros →Every word from Latin interus →