Where does “dek” come from?

dek (Middle Breton) comes from Old Breton dec, from Proto-Brythonic deg, from Proto-Celtic dekam, from Proto-Indo-European déḱm̥ — ten.

Ancestry of “dek”, step by step

StepLanguageWordMeaning
1Old Bretondec—
2Proto-Brythonicdegten
3Proto-Celticdekamten
4Proto-Indo-Europeandéḱm̥ten

Words derived from “dek”

Every word from Proto-Indo-European déḱm̥ →Every word from Proto-Celtic dekam →Every word from Proto-Brythonic deg →