Comment: Cf. Arch. erg. niIš-i (pointing to weak *-šʷ). The root is preserved only in Lezg. and Arch., being superseded in other languages by recent loanwords. The development *ʡɨ(n)šʷ > Lezg. šiw is regular (cf. *ʔis:ʷ > siw 'mouth' etc.). In Arch the initial n- is most probably metathesized from Inlaut.