Where does “pedwar ugain” come from?

pedwar ugain (Welsh) comes from Welsh pedwar, from Middle Welsh pedwar, from Old Welsh petuar, from Proto-Brythonic pedwar, from Proto-Celtic *kʷetwores, from Proto-Indo-European kʷetwóres, from Proto-Indo-European kʷe- — and.

pedwar ugain (Welsh): eighty, four score

Definitions

  1. eighty, four score

Ancestry of “pedwar ugain”, step by step

pedwar ugain traces back through two separate lines of ancestry.

via Welsh pedwar

StepLanguageWordMeaning
1Welshpedwarfour
2Middle Welshpedwar
3Old Welshpetuar
4Proto-Brythonicpedwarfour
5Proto-Celtic*kʷetworesfour
6Proto-Indo-Europeankʷetwóresfour
7Proto-Indo-Europeankʷe-and

via Welsh ugain

StepLanguageWordMeaning
1Welshugaintwenty; score
2Old Welshuceint
3Proto-Brythonicʉgėnt
4Proto-Celticwikantītwenty
5Proto-Indo-Europeanh₁wih₁ḱm̥t
6Proto-Indo-Europeandwi(h₁)dḱm̥titwo tens; two decades; twenty; two-ten
Every word from Proto-Indo-European kʷe-Every word from Proto-Indo-European kʷetwóresEvery word from Proto-Celtic *kʷetwores