yolk sac

yolk sac definition - medical

yolk sac

noun
A membranous sac attached to an embryo, enclosing food yolk. Also called umbilical vesicle.

The American Heritage® Medical Dictionary Copyright © 2009 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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