Where does “тупоугольный” come from?

тупоугольный (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.

тупоугольный (Russian): obtuse-angled

Definitions

  1. obtuse-angled

Ancestry of “тупоугольный”, step by step

тупоугольный 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 тупо́й

StepLanguageWordMeaning
1Russianтупо́йdull, blunt
2Old East Slavicтупъ—
3Proto-Slavictǫpъdull, blunt
Every word from Proto-Indo-European h₂eng- →Every word from Proto-Indo-European h₂engulos →Every word from Proto-Balto-Slavic *ángulas →