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yolk sac

2 ENTRIES FOUND:
  1. yolk sac (noun)
  2. yolk-sac placenta (noun)

yolk sac

noun

Definition of YOLK SAC

: a membranous sac of most vertebrates that encloses the yolk, is attached in most forms (as in humans) through the yolk stalk with the intestinal cavity of the embryo, and is supplied with blood vessels that transport nutritive yolk products to the developing embryo

First Known Use of YOLK SAC

1861

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