Comments:KW 456, Владимирцов 323, (Turk.-Mong.), PKE 63 (Kor.-Turk.). Low tone in Jpn. (not matching the low tone in Kor.) is probably due to contraction. The Mong. form cannot be separated, despite TMN 2, 156 ("lautgesetzlich mit der tü. Form nichts zu tun"). One should also note PTM *üge-n 'river duct' (Neg. īɣen, Ud. jogo-so, Ul. ui-n, ТМС 1, 297, 2, 250); PT *ögen (OUygh. ögen, Oyr. ȫn).