From Latin ōstium, mouth, entrance, or river mouth. An ostium (plural: ostia) is a small opening or orifice, as in a body organ or passage.

It can mean the following

• Any of the small openings or pores in a sponge for incoming water.
• Entrance into the Ancient Roman Domus (home).

[edit] Anatomy

• Ostium of Fallopian tube.
• Ostium primum or foramen ovale (ostium secundum) of the developing heart.
• Ostium maxillare of the Maxillary Sinus

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