Where does “девятиугольник” come from?

девятиугольник (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.

девятиугольник (Russian): enneagon

Definitions

  1. enneagon

Ancestry of “девятиугольник”, step by step

девятиугольник 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 девять

StepLanguageWordMeaning
1Russianдевятьnine
2Old East Slavicде́вѧтьnine
3Proto-Slavicdevętьnine
4Proto-Indo-Europeanh₁néwn̥nine
Every word from Proto-Indo-European h₂eng- →Every word from Proto-Indo-European h₂engulos →Every word from Proto-Balto-Slavic *ángulas →