Usually means: Opening where bodily fluids pass.
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We found 24 dictionaries that define the word ostium:

General (17 matching dictionaries)
  1. ostium: Merriam-Webster
  2. ostium: Oxford Learner's Dictionaries
  3. ostium: American Heritage Dictionary of the English Language
  4. ostium: Collins English Dictionary
  5. ostium: Wordnik
  6. ostium: Wiktionary
  7. ostium: Webster's New World College Dictionary, 4th Ed.
  8. ostium: Infoplease Dictionary
  9. ostium: Dictionary.com
  10. Ostium: Wikipedia, the Free Encyclopedia
  11. Ostium: Online Plain Text English Dictionary
  12. ostium: Webster's Revised Unabridged, 1913 Edition
  13. Ostium: AllWords.com Multi-Lingual Dictionary
  14. ostium: Stammtisch Beau Fleuve Acronyms
  15. ostium: FreeDictionary.org
  16. ostium: The Phrontistery - A Dictionary of Obscure Words
  17. ostium: TheFreeDictionary.com

Business (1 matching dictionary)
  1. ostium: Legal dictionary

Computing (1 matching dictionary)
  1. ostium: Encyclopedia

Medicine (5 matching dictionaries)
  1. ostium: Merriam-Webster Medical Dictionary
  2. Dorland's Illustrated Medical Dictionary (No longer online)
  3. online medical dictionary (No longer online)
  4. Ostium: Gray's Anatomy (1918)
  5. ostium: Medical dictionary

(Note: See ostia as well.)

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Definitions from Wiktionary (ostium)

▸ noun:  A small opening or orifice, as in a body organ or passage.
▸ noun:  Any of the small openings or pores in a sponge.
▸ noun:  The mouth of a river.

Similar:
orifice, osculum, foramen, fenestra, stoma, pylorus, meatus, aditus, ostomy, foramen ovale, more...

Opposite:
exit, outflow, egress

Types:
foramen, fissure, meatus, orifice, pore, sinus, stoma, duct, canal, more...

Phrases:
ostium primum, ostium secundum, coronary ostium, aortic ostium, tympanic ostium, more...

Adjectives:
coronary, natural, abdominal, left, tubal, right, accessory, sphenoid, frontal, internal, aortic



▸ Words similar to ostium

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▸ Popular adjectives describing ostium

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▸ Rhymes of ostium

▸ Invented words related to ostium

Similar:
orifice, osculum, foramen, fenestra, stoma, pylorus, meatus, aditus, ostomy, foramen ovale, more...

Opposite:
exit, outflow, egress

Types:
foramen, fissure, meatus, orifice, pore, sinus, stoma, duct, canal, more...

Phrases:
ostium primum, ostium secundum, coronary ostium, aortic ostium, tympanic ostium, gastric ostium, ostium uteri, ostium uterinum tubae, ostium vaginae, ostium abdominale tubae uterinae, ostium cardiacum, more...

Adjectives:
coronary, natural, abdominal, left, tubal, right, accessory, sphenoid, frontal, internal, aortic



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