ostium

[os-tee-uh m]
noun, plural os·ti·a [os-tee-uh] /ˈɒs ti ə/.
  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 of ostium

First recorded in 1655–65, ostium is from the Latin word ōstium entrance, river mouth
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Examples from the Web for ostium

Historical Examples of ostium


British Dictionary definitions for ostium

ostium

noun plural -tia (-tɪə) biology
  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 for ostium

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

ostium in Medicine

ostium

[ŏstē-əm]
n. pl. os•ti•a (-tē-ə)
  1. A small opening or orifice, as in a body organ.
Related formsosti•al adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.