Where does “ou” come from?

ou (Old Portuguese) comes from Latin aut, from Proto-Italic *auti, from Proto-Indo-European h₂ewti, from Proto-Indo-European h₂ew, from Proto-Indo-European ǵʰe — Postpositional intensifying particle: indeed, at any rate, in fact.

Ancestry of “ou”, step by step

StepLanguageWordMeaning
1Latinautor
2Proto-Italic*autieither, or
3Proto-Indo-Europeanh₂ewtion the other hand
4Proto-Indo-Europeanh₂ewaway from, off; again
5Proto-Indo-EuropeanǵʰePostpositional intensifying particle: indeed, at any rate, in fact

Words derived from “ou”

Every word from Proto-Indo-European ǵʰe →Every word from Proto-Indo-European h₂ew →Every word from Proto-Indo-European h₂ewti →