Proto-Lezghian: *kerk
Meaning: finger nail
Lezghian: kek
Agul: kirk
Comment: Labialization in Ag. Burk. kerkĘ· is secondary - from the oblique base kerku-). The Ag. and Lezg. information (Ag. kirku-, Lezg. kike) is insufficient for establishing the PL vowel base.