amnion

Etymology

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

noun

1. (anatomy) The innermost membrane of the fetal membranes of reptiles, birds, and mammals; the sac in which the embryo is suspended.
   He never seemed to mind, and after a while, she no longer felt self-conscious about languishing in the amnion of his office. 2022, Ling Ma, “Office Hours”, in Bliss Montage, New York: Farrar, Straus and Giroux