Where does “gastoù” come from?

gastoù (Breton) comes from Breton -où, from Proto-Brythonic -ow, from Proto-Celtic -owes.

Definitions

Ancestry of “gastoù”, step by step

StepLanguageWordMeaning
1Breton-oùNoun pluralization suffix
2Proto-Brythonic-ow—
3Proto-Celtic-owes—
Every word from Proto-Celtic -owes →Every word from Breton -où →Every word from Proto-Brythonic -ow →