a town of Asia, in Arabian Irak, on the Euphrates. It was taken by Khaled, lieutenant of the khalif Omar, in the year 632, and rebuilt by the first khalif of the Abbasides. It is 35 miles west of Baghdad. Long. 43. 2. E. Lat. 33. 15. N. This is also the name of a fortified town in Independent Tartary, 20 miles north-east of Khiva.