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单词	amnion
释义	amnion noun am·​ni·​on ˈam-nē-ˌän  -ən plural amnions or amnia ˈam-nē-ə  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 ˌam-nē-ˈä-tik  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 Medical Definition amnion noun am·​ni·​on ˈam-nē-ˌän, -ən  plural amnions or amnia -nē-ə  : 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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