from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun Any of the membranous structures closely associated with or surrounding a developing vertebrate embryo, including the amnion, chorion, allantois, and yolk sac.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun any membrane that functions for the protection or nourishment or respiration or excretion of a developing fetus
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