Comment: Obl. base *s:ɨwɨ-, cf. Lezg. sivi-, Ag. sivi-, Tsakh. sivɨ-. Cf. also (for the reflexes of *s:) Tab. Düb. už̌u, Ag. Bursh. s:iw. Tab. and Ud. reflect a metathesised form *ʔɨs:ʷ (which may be archaic in the light of external evidence). Belongs to the 4th class in all class-distinguishing languages. Rutul has not preserved the root independently; but probably a trace of it has stayed in xe-sɨ-m ( < xex-sɨ(w)-) 'face' ('nose'+'mouth').