
1) Amnios 2) Amniotic sac 3) Embryo membrane 4) Embryonic membrane 5) Embryonic sac 6) Protective membrane
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1) Amnios
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https://www.crosswordclues.com/clue/amnion

The amnion is a membrane that when first formed, closely covers the embryo. It fills with the amniotic fluid which causes the amnion to expand and become the amniotic sac which serves to provide a protective environment for the developing embryo. It is a feature of the amniotes which included reptiles, birds, and mammals. Amphibians and fish are e...
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http://en.wikipedia.org/wiki/Amnion
[Gap Cycle] The Amnion (singular, Amnioni) are a fictional alien species in Stephen R. Donaldson`s The Gap Cycle. They are shown to be the only alien race humanity has made contact with and play a major role in the series from Forbidden Knowledge onwards. Amnion are fundamentally different from any Earth creature - particularly humankind - ...
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http://en.wikipedia.org/wiki/Amnion_(Gap_Cycle)

• (n.) A thin membrane surrounding the embryos of mammals, birds, and reptiles.
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http://thinkexist.com/dictionary/meaning/amnion/

(Gr. 'bowl';'membrane enveloping the fetus') the thin but tough extraembryonic membrane of reptiles, birds, and mammals that lines the chorion and contains the fetus and the amniotic fluid around it; in mammals it is derived from trophoblast by folding or splitting.
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in reptiles, birds, and mammals, a membrane forming a fluid-filled cavity (the amniotic sac) that encloses the embryo. The amniotic sac and the ... [6 related articles]
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http://www.britannica.com/eb/a-z/a/64

A tough membrane that surrounds the embryo and fetus in the uterus. The outside of the amnion is covered by another membrane called the chorion. Amnions occur in mammals, birds, and reptiles, which are for this reason called amniotes. All land-laid eggs contain amnions; those of fish and amphibian...
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http://www.daviddarling.info/encyclopedia/A/amnion.html

<anatomy, obstetrics> A thin but tough extraembryonic membrane of reptiles, birds and mammals that lines the chorion and contains the foetus and the amniotic fluid around it, in mammals it is derived from trophoblast by folding or splitting. ... (05 Feb 1998) ...
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(am´ne-on) the innermost fetal membrane, which forms a sac filled with amniotic fluid that surrounds the embryo and later the fetus; as it enlarges it gradually obliterates the chorionic cavity and enfolds the umbilical cord. Called also bag of waters. Amnion, chorion, and other em...
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Terrestrial vertebrates have embryos that develop in fluid-filled sacs formed by the outgrowth of the extra-embryonic ectoderm and mesoderm as projecting folds. These folds fuse to form two epithelia separated by mesoderm and coelom. The inner layer is the amnion and encloses the amniotic sac in which the embryo is suspended. The outer layer is the chorion.
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Am'ni·on noun [ Greek ... the membrane round the fetus, dim. of ... lamb.]
(Anat.) A thin membrane surrounding the embryos of mammals, birds, and reptiles.
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http://www.encyclo.co.uk/webster/A/71

Type: Term Pronunciation: am′nē-on Definitions: 1. Innermost of the extraembryonic membranes enveloping the embryo in utero and containing the amniotic fluid; it consists of an internal embryonic layer with its ectodermal component and an external somatic mesodermal component; in the later stages of pregnancy the amnion expands to come i...
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http://www.medilexicon.com/medicaldictionary.php?t=2921

Amnion: A thin membrane surrounding the fetus during pregnancy. The amnion is the inner of the two fetal membranes (the chorion is the outer one). It contains the amniotic fluid.
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(am;ne-on) A developmental membrane surrounding the fetus that contains amniotic fluid.
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http://www.mhhe.com/biosci/abio/glossary.mhtml

The sac that surrounds the developing baby inside of a pregnant woman's uterus. The sac contains the baby, the placenta and the amniotic fluid. Synonym(s): Bag of waters Amniotic Sac
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http://www.pregnology.com/

The amnion is a membranous sac which surrounds the embryo; it is developed in reptiles, birds and mammals, but not in amphibians or fishes.
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The placental membrane immediately surrounding the foal.
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http://www.thehorse.com/Glossary.xhtml?L=A

In avian biology, the extra-embryonic membrane inside the egg that becomes filled with fluid and surrounds the developing embryo, allowing it to move and stay moist, and preventing its various growing parts from sticking to or blocking one another.
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https://academy.allaboutbirds.org/bird-academys-a-to-z-glossary-of-bird-ter
amniotic sac noun thin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals)
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a sac surrounding the embry filled with amniotic fluid which protects the developing embryo from shock and provides a medium for the develop embryo to exercise their muscles
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https://www.encyclo.co.uk/local/22440

The inner most layer of the membrane surrounding the embryo in the uterus. The sac formed by this membrane contains amniotic fluid.
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https://www.encyclo.co.uk/local/22445

Membrane around the fetus. It surrounds the amniotic cavity.
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https://www.encyclo.co.uk/local/22789

Membrane around the fetus. It surrounds the amniotic cavity.
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https://www.encyclo.co.uk/local/23319

the innermost of the embryonic or fetal membranes of reptiles, birds, and mammals; the sac in which the embryo is suspended. · a similar membrane of insects and other invertebrates.
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https://www.infoplease.com/dictionary/amnion
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