Where does “одиннадцатиугольник” come from?

одиннадцатиугольник (Russian) comes from Russian оди́ннадцать, from Russian оди́н, from Old East Slavic оди́нъ, from Proto-Slavic edìnъ, from Proto-Balto-Slavic edīˀnas, from Proto-Balto-Slavic aiˀnas, from Proto-Indo-European óynos — one; single.

одиннадцатиугольник (Russian): hendecagon

Definitions

  1. hendecagon

Ancestry of “одиннадцатиугольник”, step by step

одиннадцатиугольник traces back through two separate lines of ancestry.

via Russian оди́ннадцать

StepLanguageWordMeaning
1Russianоди́ннадцатьeleven (11)
2Russianоди́н—
3Old East Slavicоди́нъ—
4Proto-Slavicedìnъone
5Proto-Balto-Slavicedīˀnas—
6Proto-Balto-Slavicaiˀnasone
7Proto-Indo-Europeanóynosone; single

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 óynos →Every word from Proto-Balto-Slavic aiˀnas →Every word from Proto-Balto-Slavic edīˀnas →