amnion
/ˈæm.ni.ɑːn/noun
amnion is spelled A-M-N-I-O-N: 6 letters and 3 syllables. It appears about once in every 29 million words in written English, the 163,711th most frequent word form (wordfreq, 2021 data). As a noun, amnion means “The innermost membrane of the fetal membranes of reptiles, birds, and mammals; the sac in which the embryo is suspended” (English Wiktionary, September 2026). The plural of amnion is amnions or amnia.
How many letters and syllables are in amnion?
| Letters | 6: A-M-N-I-O-N |
|---|---|
| Syllables | 3 (from its pronunciation) |
| In writing | about once in every 29 million words; the 163,711th 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 amnion?
Amnion appears about once in every 29 million words in written English, the 163,711th 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).
How do you pronounce amnion?
- UK /ˈæm.nɪ.ɒn/
- US /ˈæm.ni.ɑːn/
Amnion has 3 syllables (counted from the pronunciation).
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Recordings: En-us-amnion.ogg, Wikimedia Commons (author and licence on each file's page).
Forms of amnion
- amnions plural
- amnia plural
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
What does amnion mean?
The meanings the English Wiktionary records, quoted as written there (source below).
noun
- 1
The innermost membrane of the fetal membranes of reptiles, birds, and mammals; the sac in which the embryo is suspended.
Near-synonym: amniotic sac
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Amnion in Spanish, French, German and Portuguese
In the sense a fetal membrane of reptiles, birds, and mammals – see also amniotic sac:
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 amnion come from?
From Latin amnion (“membrane around a fetus”), from Ancient Greek ἀμνίον (amníon).
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).