Комментарий: The Shakh-Dagh and Lezg. forms are metathesized; in Shakh-Dagh the root lost its original meaning "lung", which is preserved in Kryz. (Al.) only in the compound luzu taχul "lung" (lit. "white liver"). 4th class in Rut. and Kruz., 3d class in Arch.
Cf. also Tab. Düb. ʁurdil, Ag. Bursh. χ:urdul, Tp. ʁudul - all these forms point to PL *χ:-, while Arch. χurt:ur-t:i points to *χ- (other languages are ambivalent).