ostium

ostium

[os-tee-uhm]
noun, plural ostia [os-tee-uh] .
1.
Anatomy, Zoology. a small opening or orifice, as at the end of the oviduct.
2.
Zoology. one of the tiny holes in the body of a sponge.

Origin:
1655–65; < Latin ōstium entrance, river mouth

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

Collins English Dictionary - Complete & Unabridged 10th Edition
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Medical Dictionary

ostium os·ti·um (ŏs'tē-əm)
n. pl. os·ti·a (-tē-ə)
A small opening or orifice, as in a body organ.


os'ti·al adj.
The American Heritage® Stedman's Medical Dictionary
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