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 ?
It also contains a planar second absorbent body provided on one side of the first absorbent body in a longitudinal direction and a body fluid outlet contacting region provided with the second absorbent body to contact at least one of an ostium vaginae and an urethral meatus.