Where does “tóir” come from?

tóir (Old Irish) comes from Proto-Celtic to-wo-ret, from Proto-Celtic reteti, from Proto-Indo-European Hret- — to roll; wheel; to run, roll.

Ancestry of “tóir”, step by step

StepLanguageWordMeaning
1Proto-Celticto-wo-retrunning up to
2Proto-Celticretetito run
3Proto-Indo-EuropeanHret-to roll; wheel; to run, roll
Every word from Proto-Indo-European Hret- →Every word from Proto-Celtic reteti →Every word from Proto-Celtic to-wo-ret →