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AMNION
- a membranous sac enclosing an embryo [n AMNIA, AMNIONS] : AMNIC [adj], AMNIONIC [adj], AMNIOTIC [adj]
- a thin membrane forming a closed sac about the embryos or fetuses of reptiles, birds, and mammals and containing the amniotic fluid
- membrane analogous to the amnion and occurring in various invertebrates
- the innermost of the embryonic or fetal membranes of reptiles, birds, and mammals; the sac in which the embryo is suspended
- similar membrane of insects and other invertebrates