The Proto-Turkic word *kɨrtɨĺ
Word *kɨrtɨĺ
Meaning surface, bark, upper layer
Synonyms *kāpuk, *kaŕ

Comments
S. A. Starostin, A. V. Dybo, O. A. Mudrak - An Etymological Dictionary of Altaic Languages, 2003, Brill