ostium

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os·ti·um

 (ŏs′tē-əm)
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.]

ostium

(ˈɒstɪəm)
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]

os•ti•um

(ˈɒs ti əm)

n., pl. -ti•a (-ti ə)
a small opening or orifice of the body.
[1655–65; < Latin ōstium entrance, river mouth]
Translations
ostium
References in periodicals archive ?
Solitary coronary ostium in the aorta in the absence of other major congenital cardiovascular anomalies.
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).
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.
The calcified left coronary cusp partially obstructed the left main coronary ostium during the aortic balloon valvuloplasty without hemodynamic compromise (Fig.

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