Might mean (unverified): Embryonic nourishment sac in vertebrates.
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  1. yolksac: Wiktionary

Definitions from Wiktionary (Yolksac)

noun:  Alternative form of yolk sac [(anatomy) A membranous sac attached to an embryo, providing early nourishment in the form of yolk in bony fishes, sharks, reptiles, birds, and primitive mammals.]

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