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ostium

[os-tee-uh m] /ˈɒs ti əm/
noun, plural ostia
[os-tee-uh] /ˈɒs ti ə/ (Show IPA)
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
1655-1665
1655-65; < Latin ōstium entrance, river mouth
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for ostium

ostium

/ˈɒstɪəm/
noun (biology) (pl) -tia (-tɪə)
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
Word Origin
C17: from Latin: door, entrance
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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ostium in Medicine

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
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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