Where does “двадцатигранник” come from?

двадцатигранник (Russian) comes from Russian двадца́ть, from Russian два, from Old East Slavic дъва, from Proto-Slavic dъva, from Proto-Balto-Slavic duwō, from Proto-Indo-European dwóh₁ — two.

двадцатигранник (Russian): icosahedron

Definitions

  1. icosahedron

Ancestry of “двадцатигранник”, step by step

двадцатигранник traces back through two separate lines of ancestry.

via Russian двадца́ть

StepLanguageWordMeaning
1Russianдвадца́тьtwenty (20)
2Russianдваtwo
3Old East Slavicдъваtwo
4Proto-Slavicdъvatwo
5Proto-Balto-Slavicduwōtwo
6Proto-Indo-Europeandwóh₁two

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 dwóh₁ →Every word from Proto-Balto-Slavic duwō →Every word from Proto-Slavic dъva →