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Yolk Sac

see synonyms of yolk sac

Noun

1. umbilical vesicle, vesicula umbilicus, vitelline sac, yolk sac

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

2. yolk sac

membranous structure enclosing the yolk of eggs in birds, reptiles, marsupials, and some fishes; circulates nutrients to the developing embryo

WordNet Lexical Database for English. Princeton University. 2010.

Yolk Sac

see synonyms of yolk sac
noun zoology
1. 
the membranous sac that is attached to the ventral surface of the embryos of birds, reptiles, and some fishes and contains yolk
2. 
the corresponding part in the embryo of mammals, which contains no yolk

Collins English Dictionary. Copyright © HarperCollins Publishers

Yolk Sac

see synonyms of yolk sac
Zoology
1. 
a saclike vascular membrane containing yolk, an outgrowth from the ventral surface of very yolky vertebrate embryos, as those of fishes, birds, or reptiles, that supplies nourishment to the embryo
2. 
a homologous organ in most mammalian embryos that contains no yolk and that becomes a vestige at an early embryonic stage

Webster’s New World College Dictionary, 4th Edition. Copyright © 2010 by Houghton Mifflin Harcourt. All rights reserved.

Yolk Sac

see synonyms of yolk sac
n.
A membranous sac attached to the embryo and enclosing the yolk in egg-laying vertebrates. In humans and other placental mammals, it functions as the circulatory system for the embryo before internal circulation begins.

The American Heritage ® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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