Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • An ancient city of west-central Italy at the mouth of the Tiber River. According to legend, it was founded in the seventh century BC. Ostia developed as a port after the first century BC and declined after the third century AD.

from The Century Dictionary.

  • noun Plural of ostium.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • proper noun an ancient town in Italy at the mouth of the Tiber; the harbour of ancient Rome

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