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n. pl. os·ti·a (-tē-ə)
1. A small opening or orifice, as in a body organ or passage.
2. Any of the small openings or pores in a sponge, through which water is drawn in.

[Latin ōstium, door, opening, from ōs, mouth; see ōs- in Indo-European roots.]


n, pl -tia (-tɪə)
1. (Zoology) any of the pores in sponges through which water enters the body
2. (Zoology) any of the openings in the heart of an arthropod through which blood enters
3. (Biology) any similar opening
[C17: from Latin: door, entrance]


(ˈɒs ti əm)

n., pl. -ti•a (-ti ə)
a small opening or orifice of the body.
[1655–65; < Latin ōstium entrance, river mouth]
References in periodicals archive ?
For the single coronary, an anastomosis using the autologous pulmonary arterial vessel wall to enlarge coronary ostium can be employed to avoid ostial stenosis of the coronary artery.
There was no coronary ostium in the right aortic sinus.
Then, the conduit was pressurized with cardioplegia, and the right ventricle was dilated (short clamping of the venous line) to determine the exact position of the right coronary ostium to the graft.
2,13) As in our patient, when a coronary artery arises from the opposite sinus of Valsalva, the coronary ostium is often slit-like.
This refers to a coronary ostium (either left or right) that is at least 1 cm above the sinotubular junction (instead of being at the aortic sinus) (4,7) (Figure 4).
This was caused by either a right subclavian artery that was either tortuous or had an aberrant origin or dilated aortic root making it difficult to manipulate the catheter into the coronary ostium.
26%), one of them from the right coronary ostium, but none requiring surgery.
Four coronary arteries arising from a single coronary ostium is a rare anomaly that is generally not mentioned in comprehensive reviews of anomalous coronary arterial origin.

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