amnion

noun

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am·ni·on | \ ˈam-nē-ˌän

, -ən \

plural amnions or amnia\ ˈam-nē-ə

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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Examples of amnion in a Sentence

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, "Fossil egg discoveries, including one in Antarctica, show dinosaurs and marine reptiles laid soft-shell eggs," 17 June 2020 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

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'amnion.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.