amnion
Americannoun
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amnions,
plural
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amnia
plural
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Anatomy, Zoology. the innermost of the embryonic or fetal membranes of reptiles, birds, and mammals; the sac in which the embryo is suspended.
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Zoology. a similar membrane of insects and other invertebrates.
noun
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A thin, membranous sac filled with a watery fluid (called the amniotic fluid) in which the embryo or fetus of a reptile, bird, or mammal is suspended during prenatal development.
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Also called amniotic sac
Other Word Forms
Noun Inflected Forms
Etymology
Origin of amnion
1660–70; < Greek, equivalent to amn ( ós ) lamb ( see yean) + -ion diminutive suffix
Vocabulary lists containing amnion
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
He had two emergency corneal transplants and three amnion grafts, where tissue from the inner lining of a donated placenta was used to save his eye.
From BBC ● Feb. 19, 2025
In the following months, Mr Laskey had several procedures, including the amnion - the name of the tissue taken from the inner lining of the donated placenta - grafts.
From BBC ● Feb. 19, 2025
A method to correctly specify amnion formation is important to be able to recapitulate human embryo development as closely as possible using stem cell-based embryo models.
From Science Daily ● Mar. 4, 2024
Some grow to form the extra-embryonic membranes needed to support and protect the growing embryo: the amnion, the yolk sac, the allantois, and the chorion.
From Textbooks ● Jun. 19, 2013
The embryo thus enclosed in the egg finds its protection in the fact that it is encased in a fluid contained in the amnion.
From The Meaning of Evolution by Samuel Christian Schmucker
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