Where does “шестидневный” come from?

шестидневный (Russian) comes from Russian шесть, from Old East Slavic шесть, from Proto-Slavic šestь, from Proto-Balto-Slavic šéš, from Proto-Indo-European swéḱs — six.

шестидневный (Russian): six-day

Definitions

  1. six-day

Ancestry of “шестидневный”, step by step

шестидневный traces back through two separate lines of ancestry.

via Russian шесть

StepLanguageWordMeaning
1Russianшестьsix
2Old East Slavicшестьsix
3Proto-Slavicšestьsix
4Proto-Balto-Slavicšéšsix
5Proto-Indo-Europeanswéḱssix

via Russian день

StepLanguageWordMeaning
1Russianденьday, daytime; afternoon, early evening;...
2Old East Slavicдьньday
3Proto-Slavicdь̑nьday
Every word from Proto-Indo-European swéḱs →Every word from Proto-Balto-Slavic šéš →Every word from Proto-Slavic šestь →