Amnion Definition

ămnē-ən, -ŏn
amnia, amnions
noun
amnions
A thin, tough, membranous sac that encloses the embryo or fetus of a mammal, bird, or reptile. It is filled with a serous fluid in which the embryo or fetus is suspended.
American Heritage
The innermost membrane of the sac enclosing the embryo of a mammal, reptile, or bird: it is filled with a watery fluid (amniotic fluid)
Webster's New World
A similar membrane of certain invertebrates, esp. insects.
Webster's New World
A tough, thin membrane that forms a sac enclosing the embryo or fetus of a mammal, bird, or reptile. It is filled with a serous fluid in which the embryo or fetus is suspended.
American Heritage Medicine

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

Wiktionary

Other Word Forms of Amnion

Noun

Singular:
amnion
Plural:
amnia, amnions

Origin of Amnion

  • From Latin amnion (“membrane around a fetus”), from Ancient Greek [script?] (amnion, “bowl in which the blood of victims was caught”), from [script?] (ame, “bucket”).

    From Wiktionary

  • Greek amniōn

    From American Heritage Dictionary of the English Language, 5th Edition

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