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noun
Any membrane that functions for the protection or nourishment or respiration or excretion of a developing fetus.
is a specific kind of: membrane, tissue layer.
is a broader term that covers: allantois | caul, embryonic membrane, veil | umbilical, umbilical cord.
has as a part: amnion, amnios, amniotic sac | chorion.
Find more on fetal membrane elsewhere: etymology - rhymes - Wikipedia.
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