Comment: Cf. also Ag. Burk. jaχʷ 'fat (on meat)'. For PL *χ: cf. Arch. erg. inχ:i. 4th class in all languages. -n- in Arch. is the regular reflex of *-m- (in this position -n- lacks in Arch.). Pharyngealization in Tsakh. is not clear (probably secondary, since none of other languages reflects it).