Proto-Altaic: *sēri ( ~ z-, -ŕ-)
Meaning: thread, embroidery
Russian meaning: нить, вышивка
Comments: A Tung.-Kor. isogloss. It resembles the 'silk' / 'China' ser-/sen- Wanderwort, so it can actually go back to OC 纖 *sen (MC sjen) - but rendering MC -n with Kor. -r is extremely strange.