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amnion

noun
am·​ni·​on | \ ˈam-nē-ˌän How to pronounce amnion (audio) , -ən\
plural amnions or amnia\ -​nē-​ə How to pronounce amnia (audio) \

Definition of amnion

1 : a thin membrane forming a closed sac about the embryos or fetuses of reptiles, birds, and mammals and containing the amniotic fluid
2 : a membrane analogous to the amnion and occurring in various invertebrates
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Other Words from amnion

amniotic \ ˌam-​nē-​ˈä-​tik How to pronounce amniotic (audio) \ adjective

Examples of amnion in a Sentence

Recent Examples on the Web

 Stem cells, platelet rich plasma (PRP), placenta/amnion and their variants are the latest rage. — Profootballdoc, sandiegouniontribune.com, "New NFL treatments make news, don't always work," 1 Sep. 2017

First Known Use of amnion

1661, in the meaning defined at sense 1

History and Etymology for amnion

New Latin, from Greek, caul, from amnos lamb — more at yean

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More Definitions for amnion

amnion

noun
am·​ni·​on | \ ˈam-nē-ˌän, -ən How to pronounce amnion (audio) \
plural amnions or amnia\ -​nē-​ə How to pronounce amnia (audio) \

Medical Definition of amnion

: a thin membrane forming a closed sac about the embryos and fetuses of reptiles, birds, and mammals and containing the amniotic fluid

— called also amniotic sac

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