Where does “orulus” come from?

orulus (Latin) comes from Latin ora, from Latin os, from Proto-Italic ōs, from Proto-Indo-European h₃ésth₁ — bone.

Ancestry of “orulus”, step by step

StepLanguageWordMeaning
1Latinoraborder, rim, frontier, limit, edge; sea coast;...
2Latinosmouth; face, appearance, head; speech
3Proto-Italicōsmouth
4Proto-Indo-Europeanh₃ésth₁bone
Every word from Proto-Indo-European h₃ésth₁ →Every word from Proto-Italic ōs →Every word from Latin os →