Where does “echtrad” come from?

echtrad (Middle Irish) comes from Old Irish echtra, from Old Irish echtar, from Proto-Celtic *exteros, from Proto-Indo-European h₁eǵʰs — out.

Ancestry of “echtrad”, step by step

StepLanguageWordMeaning
1Old Irishechtra—
2Old Irishechtarwithout, outside
3Proto-Celtic*exterosoutside
4Proto-Indo-Europeanh₁eǵʰsout

Words derived from “echtrad”

Every word from Proto-Indo-European h₁eǵʰs →Every word from Proto-Celtic *exteros →Every word from Old Irish echtar →