Amnion

//ˈæm.nɪ.ɒn// noun

Definitions

Noun
  1. 1
    The innermost membrane of the fetal membranes of reptiles, birds, and mammals; the sac in which the embryo is suspended.

    "Near-synonym: amniotic sac"

  2. 2
    thin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals) wordnet

Etymology

From Latin amnion (“membrane around a fetus”), from Ancient Greek ἀμνίον (amníon).

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