Proto-Lezghian: *q:ärkʷa
Meaning: 1 nut-shell 2 bark 3 skin
Lezghian: q:ark (Khl.) 1
Agul: q:ark (Burk.) 2
Tsakhur: ʁekʷa 3
Comment: Cf. also Tsakh. Tsakh. q:ekʷa 'skin', Ag. Fit. q:ark 'bark'. Not quite clear is loss of labialization in Lezg. and Ag.