Where does “unionserth” come from?

unionserth (Welsh) comes from Welsh union, from Welsh un, from Middle Welsh un, from Proto-Brythonic ʉn, from Proto-Celtic oinos, from Proto-Indo-European óynos — one; single.

unionserth (Welsh): perpendicular

Definitions

  1. perpendicular

Ancestry of “unionserth”, step by step

unionserth traces back through two separate lines of ancestry.

via Welsh union

StepLanguageWordMeaning
1Welshunionexact
2Welshunonly; one; one, individual
3Middle Welshunone
4Proto-Brythonicʉnone
5Proto-Celticoinosone
6Proto-Indo-Europeanóynosone; single

via Welsh serth

StepLanguageWordMeaning
1Welshserthsteep
Every word from Proto-Indo-European óynos
unionserth — Etymology, Origin & Word History | Etymology Explorer