FromMiddle Welshdyð, fromOld Welshdid, fromProto-Brythonic*dɨð, fromProto-Celtic*dyīus (compareCornishdydh,Bretondeiz,Old Irishdía), fromProto-Indo-European*dyḗws (compareLatindiēs).
dydd m (pluraldyddiau)
- day,daytime
- Dydd generally refers to the uncountable period of light.Dydd is also used with the names days of the week and with holiday and festival names. It its in contrast to the wordnos(“night, evening”). (cf. Frenchjour, Italiangiorno)
- yn ystod ydydd ―during theday(time)
- dydd Wener ―Fridayday(time)
- Dydd Calan ―New Year'sDay
- Diwrnod, on the other hand, is countable and refers to an individual day and so is the word used when employing a qualifying numeral or adjective. It is there the opposite ofnoson(“night, evening”). (cf. Frenchjournée, Italiangiornata)
- diwrnod gwych ―a greatday
- tridiwrnod ―threedays
Note: Certain mutated forms of some words can never occur in standard Welsh.
All possible mutated forms are displayed for convenience.
- R. J. Thomas, G. A. Bevan, P. J. Donovan, A. Hawke et al., editors (1950–present), “dydd”, inGeiriadur Prifysgol Cymru Online (in Welsh), University of Wales Centre for Advanced Welsh & Celtic Studies
