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Definitions and Synonyms of yolk sac | Another word for yolk sac | What is yolk sac?

Definition 1: membranous structure enclosing the yolk of eggs in birds, reptiles, marsupials, and some fishes; circulates nutrients to the developing embryo - [noun denoting animal]

(yolk sac is a kind of ...) a structure resembling a bag in an animal

Definition 2: membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional - [noun denoting animal]

Synonyms for yolk sac in the sense of this definition

(yolk sac is a kind of ...) a structure resembling a bag in an animal

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