Where does “нитяной” come from?

нитяной (Russian) comes from Russian нить, from Old East Slavic нить, from Proto-Slavic nitь, from Proto-Balto-Slavic nítis, from Proto-Indo-European (s)nh₁itis, from Proto-Indo-European (s)neh₁- — to spin (thread), to sew.

Ancestry of “нитяной”, step by step

StepLanguageWordMeaning
1Russianнитьthread; filament; suture
2Old East Slavicнитьthread
3Proto-Slavicnitьthread
4Proto-Balto-Slavicnítis—
5Proto-Indo-European(s)nh₁itis—
6Proto-Indo-European(s)neh₁-to spin (thread), to sew
Every word from Proto-Indo-European (s)neh₁- →Every word from Proto-Indo-European (s)nh₁itis →Every word from Proto-Balto-Slavic nítis →