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 …

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.

Dec 26, 2025 · Noun [edit] 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.

Ostium is a self-custodial leveraged trading platform built on crypto rails. You can trade stocks, currencies, indices, commodities, and cryptocurrencies directly on Arbitrum, an Ethereum …

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.

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

Most commonly, an ostium is defined as any kind of small opening in the body. These openings can be external, such as pores, or internal, such as the chambers of the heart.

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