OVADA, a town of the kingdom of Sardinia, division of Alessandria, stands on the Orba, 9 miles S.W. of Acqui, and 20 S. of Alessandria. For the most part it is well built; and contains several churches, convents, schools, and hospitals, and a theatre. One of the churches is a handsome building. Manufactures of cloth, vermicelli, hardware, and silk, are carried on; and there is some trade in wine and silk. Pop. 6177.