Comments:A Mong.-Jpn. isogloss. There may be, however, some traces in Turkic as well: cf. Karakh. (MK, see EDT 891-892) jaδɨŋ suv 'water spreading over the surface of the ground', closely paralleling, e.g., Khalkha ʒadgaj usu 'pond, pool'. Cf. also the old name of the Ural river, PT *jadɨk, which is considered to be pre-Turkish (see EDT 981), but may be genuine. The attributive usage both in Turkic and Mongolian makes one wonder whether the root in fact is not a specialization of PA *ǯādV 'spread' q. v.