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amnion

noun

am·​ni·​on ˈam-nē-ˌän How to pronounce amnion (audio)
-ən
plural amnions or amnia ˈam-nē-ə How to pronounce amnion (audio)
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
amniotic adjective

Example Sentences

Recent Examples on the Web Birds, mammals and reptiles called amniotes produce eggs that include an amnion, or inner membrane, that keeps the embryo inside from drying out. Ashley Strickland, CNN, 17 June 2020 Stem cells, platelet rich plasma (PRP), placenta/amnion and their variants are the latest rage. Profootballdoc, sandiegouniontribune.com, 1 Sep. 2017

Word History

Etymology

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

First Known Use

1661, in the meaning defined at sense 1

Time Traveler
The first known use of amnion was in 1661

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