- a town in central Italy, SW of Rome: ruins from 4th century b.c.; site of ancient port of Rome.
noun, plural os·ti·a [os-tee-uh] /ˈɒs ti ə/.
- Anatomy, Zoology. a small opening or orifice, as at the end of the oviduct.
- Zoology. one of the tiny holes in the body of a sponge.
- 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
noun plural -tia (-tɪə) biology
- any of the pores in sponges through which water enters the body
- any of the openings in the heart of an arthropod through which blood enters
- any similar opening
n. pl. os•ti•a (-tē-ə)
- A small opening or orifice, as in a body organ.