amnion
Americannoun
plural
amnions, amnia-
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
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.
But a single placenta can make anywhere between 50 to 100 amnion grafts.
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 Schmucker, Samuel Christian
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
