Where does “тринадцатиугольник” come from?

тринадцатиугольник (Russian) comes from Russian трина́дцать, from Russian три, from Macedonian трие, from Proto-Slavic trьje, from Proto-Balto-Slavic tríjes, from Proto-Indo-European *tréyes.

тринадцатиугольник (Russian): tridecagon

Definitions

  1. tridecagon

Ancestry of “тринадцатиугольник”, step by step

тринадцатиугольник traces back through two separate lines of ancestry.

via Russian трина́дцать

StepLanguageWordMeaning
1Russianтрина́дцатьthirteen (13)
2Russianтриthree; second-person singular imperative...
3Macedonianтриеto rub
4Proto-Slavictrьjethree
5Proto-Balto-Slavictríjesthree
6Proto-Indo-European*tréyes—

via Russian у́гол

StepLanguageWordMeaning
1Russianу́голangle; corner
2Proto-Slavicǫgъlъcorner, angle
3Proto-Balto-Slavic*ángulas—
4Proto-Indo-Europeanh₂engulosjoint?
5Proto-Indo-Europeanh₂eng-curve, bend
Every word from Proto-Indo-European *tréyes →Every word from Proto-Balto-Slavic tríjes →Every word from Proto-Slavic trьje →