Where does “трёхсторонний” come from?

трёхсторонний (Russian) comes from Russian -ний, from Proto-Slavic -ьnъ — -ish, -ic, -al, -ed; From adjectives.

трёхсторонний (Russian): three-sided

Definitions

  1. three-sided

Ancestry of “трёхсторонний”, step by step

StepLanguageWordMeaning
1Russian-нийUsed to form adjectives from nouns, often...
2Proto-Slavic-ьnъ-ish, -ic, -al, -ed; From adjectives
Every word from Proto-Slavic -ьnъ →Every word from Russian -ний →