Where does “oss” come from?

oss (Old Irish) comes from Proto-Celtic uxsū, from Proto-Indo-European uksḗn, from Proto-Indo-European h₂ug-s-ḗn.

Ancestry of “oss”, step by step

StepLanguageWordMeaning
1Proto-Celticuxsūox, stag
2Proto-Indo-Europeanuksḗnbull
3Proto-Indo-Europeanh₂ug-s-ḗn—

Words derived from “oss”

Every word from Proto-Indo-European h₂ug-s-ḗn →Every word from Proto-Indo-European uksḗn →Every word from Proto-Celtic uxsū →