An ancient city and harbour which was situated on the western coast of Italy at the mouth of the River Tiber. It was the first colony founded by ancient Rome and was a major port and commercial centre.
Definition of Ostia in US English:
Ostia
proper nounˈästēə
An ancient city and harbor that was situated on the western coast of Italy at the mouth of the Tiber River. It was the first colony founded by ancient Rome and was a major port and commercial center.