Ostia

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Os·ti·a

 (ŏs′tē-ə, ô′styä)
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.

os·ti·a

 (ŏs′tē-ə)
n.
Plural of ostium.

Ostia

(ˈɒstɪə)
n
(Placename) an ancient town in W central Italy, originally at the mouth of the Tiber but now about 6 km (4 miles) inland: served as the port of ancient Rome; harbours built by Claudius and Trajan; ruins excavated since 1854

Os•ti•a

(ˈɒs ti ə)

n.
a town in central Italy, SW of Rome: ruins from 4th century B.C.; site of ancient port of Rome.