Комментарии: PAT *š́ǝ-qa (cf. also Bz. á-š́χa); PAK *ʎa-ɣá; Ub. def. á-ʎaxa. In all three subgroups the root is present only within compounds: in PAT cf. *qA 'head'; in PAK the second part may be related to *bɣǝ 'mountain'; in Ub. it goes back to *xʷA 'mountain, hill'. See Шагиров 1, 244-245 with literature.