Where does “девятигранник” come from?

девятигранник (Russian) comes from Russian девять, from Old East Slavic де́вѧть, from Proto-Slavic devętь, from Proto-Indo-European h₁néwn̥ — nine.

девятигранник (Russian): enneahedron

Definitions

  1. enneahedron

Ancestry of “девятигранник”, step by step

девятигранник traces back through two separate lines of ancestry.

via Russian девять

StepLanguageWordMeaning
1Russianдевятьnine
2Old East Slavicде́вѧтьnine
3Proto-Slavicdevętьnine
4Proto-Indo-Europeanh₁néwn̥nine

via Russian грань

StepLanguageWordMeaning
1Russianграньface; facet, side; border, verge, brink
2Old East Slavicгрань—
3Proto-Slavicgranьside, edge
4Proto-Slavic-nьDeverbative, creates nouns
Every word from Proto-Indo-European h₁néwn̥ →Every word from Proto-Slavic devętь →Every word from Old East Slavic де́вѧть →