ostium

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noun

A small opening or orifice, as in a body organ or passage.

OriginLatin ōstium →
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Meanings

nounostium (plural ostia)

plural ostia

  1. A small opening or orifice, as in a body organ or passage.
  2. Any of the small openings or pores in a sponge.
  3. The mouth of a river.

Origin

  1. Latinōstium
  2. Latinōstium
  3. Englishostium

Borrowed from Latin ōstium.

More words from Latin

Full word history & related roots →

Translations

German Ostium
  • Ostiumsmall opening or orifice
Cite this entry
APA

ostium. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/ostium

MLA

“ostium.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/ostium. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “ostium,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/ostium.

Source: ostium on Wiktionary, CC BY-SA 4.0.