Where does “hirddydd” come from?

hirddydd (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.

hirddydd (Welsh): long day

Definitions

  1. long day

Ancestry of “hirddydd”, step by step

hirddydd 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 Welsh hir

StepLanguageWordMeaning
1Welshhirlong; h-prothesized form of ir
2Proto-Brythonichirlong, tall
3Proto-Celticsīroslong
4Proto-Indo-Europeanseh₁-ró-s—
5Proto-Indo-Europeanseh₁-to impress, insert; to sow, to plant; long,...
Every word from Proto-Indo-European dyew- →Every word from Proto-Indo-European dyéws →Every word from Proto-Indo-European dyḗws →