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
Synonyms:

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

Amnion Sentence Examples

  • Kowalevsky or a bug is invaginated into the yolk at the head end, the portion of (1871 and 1887) on the embryology of the water-beetle Hydrophilus the blastoderm necessarily pushed in with it forming the amnion.

  • Wheeler, the amnion is ruptured and turned back from covering the germ band, enclosing the yolk dorsally and becoming finally absorbed, as the ectoderm of the germ band itself spreads to form the dorsal wall.

  • In some midges and in caddis-flies the serosa becomes ruptured and absorbed, while the germ band, still clothed with the amnion, grows around the yolk.

  • In moths and certain saw-flies there is no rupture of the membranes; the Russian zoologists Tichomirov and Kovalevsky have described the growth of both amnion and embryonic ectoderm around the yolk, the embryo being thus completely enclosed until hatching time by both amnion and serosa.

  • They are separated from fishes and batrachians (Pisces and Batrachians) on the one hand, and agree with reptiles, and birds (Reptilia and A y es) on the other, in the possession during intra-uterine life of the membranous vascular structures respectively known as the amnion and the allantois, and likewise in the absence at this or any other period of external gills.

More Sentences

Find Similar Words

Find similar words to amnion using the buttons below.

Words Starting With

AAMAMN

Words Ending With

NONION

Unscrambles

amnion

Words Starting With A and Ending With N

Starts With A & Ends With NStarts With AM & Ends With NStarts With A & Ends With ON

Word Length

6 Letter Words6 Letter Words Starting With A6 Letter Words Ending With N