Where does “deuddydd” come from?

deuddydd (Welsh) comes from Welsh dydd, from Middle Welsh dyð, from Old Welsh did, from Proto-Brythonic dið, from Proto-Celtic dīyos, from Proto-Indo-European dyḗws, from Proto-Indo-European dyéws, from Proto-Indo-European dyew- — to be bright; sky, heaven.

deuddydd (Welsh): (period of) two days

Definitions

  1. (period of) two days

Ancestry of “deuddydd”, step by step

deuddydd traces back through two separate lines of ancestry.

via Welsh dydd

StepLanguageWordMeaning
1Welshdyddday, daytime
2Middle Welshdyðday
3Old Welshdidday
4Proto-Brythonicdiðday, daytime
5Proto-Celticdīyosday
6Proto-Indo-Europeandyḗwssky, heaven; sky god
7Proto-Indo-Europeandyéwssky, heaven
8Proto-Indo-Europeandyew-to be bright; sky, heaven

via Proto-Indo-European deu-

StepLanguageWordMeaning
1Proto-Indo-Europeandeu-lack, fail; to injure, destroy, burn; to do,...
2Middle Welshdeutwo
3Proto-Brythonic*dowtwo
4Proto-Celtic*duwotwo
5Proto-Indo-Europeandwóh₁two
Every word from Proto-Indo-European dyew- →Every word from Proto-Indo-European dyéws →Every word from Proto-Indo-European dyḗws →