Where does “ôl-ddyddio” come from?

ôl-ddyddio (Welsh) comes from Welsh dyddio, 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 — to be bright; sky, heaven.

ôl-ddyddio (Welsh): to backdate

Definitions

  1. to backdate

Ancestry of “ôl-ddyddio”, step by step

ôl-ddyddio traces back through two separate lines of ancestry.

via Welsh dyddio

StepLanguageWordMeaning
1Welshdyddioto dawn, to become day
2Welshdyddday, daytime
3Middle Welshdyðday
4Old Welshdidday
5Proto-Brythonicdiðday, daytime
6Proto-Celticdīyosday
7Proto-Indo-Europeandyḗwssky, heaven; sky god
8Proto-Indo-Europeandyéwssky, heaven
9Proto-Indo-Europeandyew-to be bright; sky, heaven

via Welsh ôl

StepLanguageWordMeaning
1Welshôltrack, trace; mark, residue; back, rear
Every word from Proto-Indo-European dyew- →Every word from Proto-Indo-European dyéws →Every word from Proto-Indo-European dyḗws →