tri (Welsh)
Where does "tri" come from?
The Welsh word 'tri' descends directly from the Proto-Brythonic *tri and the earlier Proto-Celtic *trīs. These forms trace back to the Proto-Indo-European *tréyes, a root that has served as the foundation for the word 'three' across numerous languages for thousands of years.
Full etymology tree
- tri (Welsh), 'three'
- inherited *tri (Proto-Brythonic), 'three'
- inherited *trīs (Proto-Celtic), 'three'
- inherited *tréyes (Proto-Indo-European), 'three'
- inherited *trīs (Proto-Celtic), 'three'
- inherited *tri (Proto-Brythonic), 'three'
Ancestors
- *tri (Proto-Brythonic)
- *trīs (Proto-Celtic)
- *tréyes (Proto-Indo-European)
Descendants and derived words
- trisain (Welsh)
Updated July 2026
Etymology data from Wiktionary, CC BY-SA 4.0 · About Miraris