Where does “rrex” come from?

rrex (Proto-Brythonic) comes from Proto-Celtic ɸrikkā, from Proto-Indo-European perd- — to fart loudly, pass gas, break wind.

Ancestry of “rrex”, step by step

StepLanguageWordMeaning
1Proto-Celticɸrikkā—
2Proto-Indo-Europeanperd-to fart loudly, pass gas, break wind

Words derived from “rrex”

Every word from Proto-Indo-European perd- →Every word from Proto-Celtic ɸrikkā →