An ostium (pl.: ostia) in anatomy is a small opening or orifice. Ostia, not as a plural, is also the name of a number of places. Ostium or ostia may refer to: Sinus ostium an opening that connects a sinus to the …

The ostium, or opening, of the right coronary artery is in the right aortic sinus and that of the left coronary artery is in the left aortic sinus, just above the aortic valve ring.

The meaning of OSTIUM is a mouthlike opening in a bodily part (such as a fallopian tube or a blood vessel). How to use ostium in a sentence.

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Dec 26, 2025 · ostium (plural ostia) A small opening or orifice, as in a body organ or passage. Any of the small openings or pores in a sponge. The mouth of a river.

The mucus produced in your sinuses normally drains into your nose through small holes called ostia. The catheter is advanced until its end reaches the coronary ostium.

ostium pri´mum an opening in the lower portion of the membrane dividing the embryonic heart into right and left sides. See also atrial septal defect and congenital heart defect.

Definition of 'ostium' ostium in British English (ˈɒstɪəm ) noun Word forms: plural -tia (-tɪə ) biology

Ostium definition: a small opening or orifice, as at the end of the oviduct.. See examples of OSTIUM used in a sentence.

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.