Where does “семнадцатиугольник” come from?

семнадцатиугольник (Russian) comes from Russian у́гол, from Proto-Slavic ǫgъlъ, from Proto-Balto-Slavic *ángulas, from Proto-Indo-European h₂engulos, from Proto-Indo-European h₂eng- — curve, bend.

семнадцатиугольник (Russian): heptadecagon

Definitions

  1. heptadecagon

Ancestry of “семнадцатиугольник”, step by step

семнадцатиугольник traces back through two separate lines of ancestry.

via Russian у́гол

StepLanguageWordMeaning
1Russianу́голangle; corner
2Proto-Slavicǫgъlъcorner, angle
3Proto-Balto-Slavic*ángulas
4Proto-Indo-Europeanh₂engulosjoint?
5Proto-Indo-Europeanh₂eng-curve, bend

via Russian семна́дцать

StepLanguageWordMeaning
1Russianсемна́дцатьseventeen (17)
2Russianсемьseven
3Proto-Slavicsedmьseven
4Proto-Indo-Europeanseptḿ̥seven
Every word from Proto-Indo-European h₂eng-Every word from Proto-Indo-European h₂engulosEvery word from Proto-Balto-Slavic *ángulas