ostium
noun
ostium is spelled O-S-T-I-U-M: 6 letters. It appears about once in every 30 million words in written English, the 165,739th most frequent word form (wordfreq, 2021 data). As a noun, ostium means “A small opening or orifice, as in a body organ or passage” (English Wiktionary, September 2026). The plural of ostium is ostia.
How many letters and syllables are in ostium?
| Letters | 6: O-S-T-I-U-M |
|---|---|
| In writing | about once in every 30 million words; the 165,739th most frequent word form |
| Wrong spellings searched | none measured in search |
Sources: letters and syllables from the English Wiktionary's hyphenation or pronunciation; written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
How common is ostium?
Ostium appears about once in every 30 million words in written English, the 165,739th most frequent word form in the list.
Source: written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
Forms of ostium
- ostia plural
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
What does ostium mean?
The meanings the English Wiktionary records, quoted as written there (source below).
noun
- 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.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Ostium in Spanish, French, German and Portuguese
In the sense small opening or orifice:
| Language | Words |
|---|---|
| German | Ostium |
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Translations are Wiktionary's, by sense; a linked word has its own PlainSpell page.
Where does ostium come from?
Borrowed from Latin ōstium.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).