OSSERO, a town of the island of Cherso, in the Adriatic, within the Austrian province of Trieste. It stands on the western side of the island, on a promontory, and is the see of a bishop, but with only 360 houses and 1540 inhabitants. It is also the name of an island separated from Cherso by a narrow channel which is not passable by vessels. It is well cultivated, and very productive of wine. It contains two townships or communes, with 1600 houses and 7200 inhabitants.