Comments: PTsKh *šigʷǝ (~-ɨ-). The same root can be probably discovered also, with irregular transformations, in Tsez. širšaʁIu 'horses (collect.)', probably going back to *šigʷ(V)-sirjo "mare+stallion" (cf. the same compound in Gunz. šugu-sǝrjo, Bezht. Tl. šügö-sojra).