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Dictionary

ex'traembryon'ic mem'brane

Embryol.
any of the tissues, derived from the fertilized egg, that enclose or otherwise contribute to the support of the developing embryo, as the yolk sac, allantois, amnion, and chorion. Also called embryonic membrane.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

extraembryonic

extrafloral

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