amnion


am·ni·on

noun \ˈam-nē-ˌän, -ən\
plural ; amnionsor ; am·nia \-nē-ə\ (audio pronunciation)

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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