Where does “семиструнный” come from?

семиструнный (Russian) comes from Russian стру́нный, from Russian -ный, from Old Church Slavonic -ьнъ, from Proto-Slavic -ьnъ — -ish, -ic, -al, -ed; From adjectives.

семиструнный (Russian): seven-string (of a guitar)

Definitions

  1. seven-string (of a guitar)

Ancestry of “семиструнный”, step by step

семиструнный traces back through two separate lines of ancestry.

via Russian стру́нный

StepLanguageWordMeaning
1Russianстру́нныйstring of a musical instrument
2Russian-ный-ish, -ic, -al, -ed
3Old Church Slavonic-ьнъish, -ic, -al, -ed
4Proto-Slavic-ьnъ-ish, -ic, -al, -ed; From adjectives

via Russian семь

StepLanguageWordMeaning
1Russianсемьseven
2Proto-Slavicsedmьseven
3Proto-Indo-Europeanseptḿ̥seven
Every word from Proto-Slavic -ьnъ →Every word from Russian -ный →Every word from Old Church Slavonic -ьнъ →