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umbilical vesicle


from the GNU version of the Collaborative International Dictionary of English

  • adj. a saccular appendage of the developing embryo, containing the nutritive and unsegmented part of the ovum; the yolk sac. See Illust. in Appendix.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional


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