Where does “dwóchsetny” come from?

dwóchsetny (Polish) comes from Polish dwa, from Old Polish dwa, from Proto-Slavic dъva, from Proto-Balto-Slavic duwō, from Proto-Indo-European dwóh₁ — two.

Ancestry of “dwóchsetny”, step by step

dwóchsetny traces back through two separate lines of ancestry.

via Polish dwa

StepLanguageWordMeaning
1Polishdwatwo
2Old Polishdwatwo
3Proto-Slavicdъvatwo
4Proto-Balto-Slavicduwōtwo
5Proto-Indo-Europeandwóh₁two

via Polish setny

StepLanguageWordMeaning
1Polishsetnyhundredth
2Proto-Slavic*sъtьnъ—
Every word from Proto-Indo-European dwóh₁ →Every word from Proto-Balto-Slavic duwō →Every word from Proto-Slavic dъva →