Meaning & use
Amnion
Last updated
The thin, tough membrane that forms a fluid-filled sac enclosing an embryo in mammals, birds, and reptiles, protecting and cushioning it during development.
See it in a sentence
The amnion ruptures naturally when a woman's water breaks before childbirth.
Researchers study the amnion to better understand fetal development and protection.
A note on using this word
The amnion is one of the defining features of "amniotes," the group of vertebrates that includes reptiles, birds, and mammals, distinguishing them from amphibians and fish, which lack this protective membrane.
Words with a similar meaning
amniotic sac
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