Where does “тридесет” come from?

тридесет (Serbo-Croatian) comes from Serbo-Croatian де̏сет, from Proto-Slavic desętь, from Proto-Balto-Slavic *déśimt, from Proto-Indo-European déḱm̥t — ten.

тридесет (Serbo-Croatian): thirty

Definitions

  1. thirty

Ancestry of “тридесет”, step by step

тридесет traces back through two separate lines of ancestry.

via Serbo-Croatian де̏сет

StepLanguageWordMeaning
1Serbo-Croatianде̏сетten
2Proto-Slavicdesętьten
3Proto-Balto-Slavic*déśimtten
4Proto-Indo-Europeandéḱm̥tten

via Serbo-Croatian три̑

StepLanguageWordMeaning
1Serbo-Croatianтри̑three
2Proto-Slavictrьjethree
3Proto-Balto-Slavictríjesthree
4Proto-Indo-European*tréyes—
Every word from Proto-Indo-European déḱm̥t →Every word from Proto-Balto-Slavic *déśimt →Every word from Proto-Slavic desętь →