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ostium An opening, derived from the Latin word for a door or opening. In Porifera, one of the openings through which water is drawn into the body. In Arthropoda, one of the openings in the wall of the heart into the pericardial (blood-filled) Sinus.

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What actors and actresses appeared in Ostium - 2010?

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What is more correct osteomeatal or ostiomeatal?

Ostiomeatal complex is correct because this refers to an opening in the sinus (ostium) and not the bone, which the other spelling would indicate.