Where does “trisain” come from?

trisain (Welsh) comes from Welsh tri, from Proto-Brythonic tri, from Proto-Celtic trīs, from Proto-Indo-European *tréyes.

trisain (Welsh): triphthong

Definitions

  1. triphthong

Ancestry of “trisain”, step by step

trisain traces back through two separate lines of ancestry.

via Welsh tri

StepLanguageWordMeaning
1Welshtrithree
2Proto-Brythonictrithree
3Proto-Celtictrīsthree
4Proto-Indo-European*tréyes—

via Welsh sain

StepLanguageWordMeaning
1Welshsainsound
Every word from Proto-Indo-European *tréyes →Every word from Proto-Celtic trīs →Every word from Proto-Brythonic tri →