amnion

A1M3N1I1O1N1
UK/ˈæm.nɪ.ɒn/US/ˈæm.ni.ɑːn/

noun

The innermost membrane of the fetal membranes of reptiles, birds, and mammals; the sac in which the embryo is suspended.

“Near-synonym: amniotic sac”

Similar
amniosamniotic sac
OriginLatin amnion ← Ancient Greek ἀμνίον →
UncommonScrabble 8
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Meanings

nounamnion (plural amnions or amnia)

plural amnions · plural amnia

  1. anatomyThe innermost membrane of the fetal membranes of reptiles, birds, and mammals; the sac in which the embryo is suspended.

    Near-synonym: amniotic sac

    1 more example

    He never seemed to mind, and after a while, she no longer felt self-conscious about languishing in the amnion of his office.

    2022, Ling Ma, “Office Hours”, in Bliss Montage, New York: Farrar, Straus and Giroux, →ISBN

    Synonyms: amnios, amniotic sac

Synonyms & antonyms

nounThe innermost membrane of the fetal membranes of reptiles, birds, and mammals; the sac in which the embryo is suspended.

Similar
amniosamniotic sac

More synonyms by meaning

nounthin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals)

Similar
amniotic sacamnios
Broader
sac
Also see
amniosamniotic sac

Synonym sets from Open English WordNet, CC BY 4.0.

Origin

  1. Ancient Greekἀμνίον
  2. Latinamnion“membrane around a fetus”
  3. Englishamnion

From Latin amnion (“membrane around a fetus”), from Ancient Greek ἀμνίον (amníon).

More words from Latin, Ancient Greek

Full word history & related roots →

Translations

Ancient Greek ἀμνίον
  • ἀμνίον (amníon)a fetal membrane of reptiles, birds, and mammals — see also amniotic sac
Arabic سَلى, أَمْنِيُون
  • سَلى (salan)a fetal membrane of reptiles, birds, and mammals — see also amniotic sac
  • أَمْنِيُون (ʔamniyūn)a fetal membrane of reptiles, birds, and mammals — see also amniotic sac
Catalan amni
  • amnia fetal membrane of reptiles, birds, and mammals — see also amniotic sac
Chinese Cantonese 羊膜
  • 羊膜a fetal membrane of reptiles, birds, and mammals — see also amniotic sac
Chinese Mandarin 羊膜
  • 羊膜 (yángmó)a fetal membrane of reptiles, birds, and mammals — see also amniotic sac
Czech ovčí blána, amnion
  • ovčí blánaa fetal membrane of reptiles, birds, and mammals — see also amniotic sac
  • amniona fetal membrane of reptiles, birds, and mammals — see also amniotic sac
Dutch amnion
  • amniona fetal membrane of reptiles, birds, and mammals — see also amniotic sac
Esperanto amnio
  • amnioa fetal membrane of reptiles, birds, and mammals — see also amniotic sac
Finnish vesikalvo
  • vesikalvoa fetal membrane of reptiles, birds, and mammals — see also amniotic sac
French amnios
  • amniosa fetal membrane of reptiles, birds, and mammals — see also amniotic sac
German Schafhaut, Amnion
  • Schafhauta fetal membrane of reptiles, birds, and mammals — see also amniotic sac
  • Amniona fetal membrane of reptiles, birds, and mammals — see also amniotic sac
Hebrew שָׁפִיר
  • שָׁפִיר (shafír)a fetal membrane of reptiles, birds, and mammals — see also amniotic sac
Hungarian magzatburok
  • magzatburoka fetal membrane of reptiles, birds, and mammals — see also amniotic sac
Indonesian amnion
  • amniona fetal membrane of reptiles, birds, and mammals — see also amniotic sac
Irish aimnín
  • aimnína fetal membrane of reptiles, birds, and mammals — see also amniotic sac
Italian amnio
  • amnioa fetal membrane of reptiles, birds, and mammals — see also amniotic sac
Japanese 羊膜
  • 羊膜 (yōmaku)a fetal membrane of reptiles, birds, and mammals — see also amniotic sac
Korean 양막
  • 양막 (yangmak)a fetal membrane of reptiles, birds, and mammals — see also amniotic sac
Latin amnion
  • amniona fetal membrane of reptiles, birds, and mammals — see also amniotic sac
Māori kahukahu
  • kahukahua fetal membrane of reptiles, birds, and mammals — see also amniotic sac
Persian مشیمیه, مشیمه
  • مشیمیه (mašīmiye)a fetal membrane of reptiles, birds, and mammals — see also amniotic sac
  • مشیمه (mašīme)a fetal membrane of reptiles, birds, and mammals — see also amniotic sac
  • آتون (ātun)a fetal membrane of reptiles, birds, and mammals — see also amniotic sac
Polish owodnia, amnion
  • owodniaa fetal membrane of reptiles, birds, and mammals — see also amniotic sac
  • amniona fetal membrane of reptiles, birds, and mammals — see also amniotic sac
Portuguese âmnio
  • âmnioa fetal membrane of reptiles, birds, and mammals — see also amniotic sac
Romanian amnios
  • amniosa fetal membrane of reptiles, birds, and mammals — see also amniotic sac
Russian амнио́н
  • амнио́н (amnión)a fetal membrane of reptiles, birds, and mammals — see also amniotic sac
Slovak amnión
  • amnióna fetal membrane of reptiles, birds, and mammals — see also amniotic sac
Spanish amnios
  • amniosa fetal membrane of reptiles, birds, and mammals — see also amniotic sac
Tamil பனிக்குடம், பன்னீர்க்குடம்
  • பனிக்குடம் (paṉikkuṭam)a fetal membrane of reptiles, birds, and mammals — see also amniotic sac
  • பன்னீர்க்குடம் (paṉṉīrkkuṭam)a fetal membrane of reptiles, birds, and mammals — see also amniotic sac
Vietnamese màng ối
  • màng ốia fetal membrane of reptiles, birds, and mammals — see also amniotic sac

Rhymes & wordplay

Anagrams

MinoanManionnimona
Cite this entry
APA

amnion. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/amnion

MLA

“amnion.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/amnion. Accessed November 2, 2026.

Chicago

WatkinsX Dictionary, s.v. “amnion,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/amnion.

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