Where does “berth” come from?

berth (Middle Welsh) comes from Proto-Brythonic berθ, from Proto-Celtic berxtos, from Proto-Indo-European bʰer(H)ǵ-tó-s, from Proto-Indo-European -tós — Creates verbal adjectives from verb stems.

Ancestry of “berth”, step by step

StepLanguageWordMeaning
1Proto-Brythonicberθbeautiful, bright, fine
2Proto-Celticberxtosbright
3Proto-Indo-Europeanbʰer(H)ǵ-tó-s—
4Proto-Indo-European-tósCreates verbal adjectives from verb stems

Words derived from “berth”

Every word from Proto-Indo-European -tós →Every word from Proto-Indo-European bʰer(H)ǵ-tó-s →Every word from Proto-Celtic berxtos →