Where does “deufis” come from?

deufis (Welsh) comes from Proto-Indo-European deu-, from Middle Welsh deu, from Proto-Brythonic *dow, from Proto-Celtic *duwo, from Proto-Indo-European dwóh₁ — two.

deufis (Welsh): (period of) two months

Definitions

  1. (period of) two months

Ancestry of “deufis”, step by step

deufis traces back through two separate lines of ancestry.

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

via Welsh mis

StepLanguageWordMeaning
1Welshmismonth
2Proto-Celticmīnsmonth
3Proto-Indo-Europeanmḗh₁n̥smoon; month
4Proto-Indo-Europeanmeh₁-to measure
Every word from Proto-Indo-European dwóh₁ →Every word from Proto-Celtic *duwo →Every word from Proto-Brythonic *dow →