Comment: Labialization was early lost in all languages except Arch. (cf. also Arch. plur. ʎʷ-at) and Ud. In Tsakh. the stem is reduplicated, but cf. also Tsakh. oxan-as 'to eat' which obviously belongs here too (the -n-conjugation may be explained either as secondary suffixation or as a result of contamination with the PL root *ʔikʷVn- 'to eat' q.v.).
The name for "grass" in Kryz. and Bud. (cf. also Rut. xɨn id.) can be explained as a derivate of the same verbal root (PL *(ʔi)ʎʷon).