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yolk sac. In DICTIOUS you will not only get to know all the dictionary meanings for the word
yolk sac, but we will also tell you about its etymology, its characteristics and you will know how to say
yolk sac in singular and plural. Everything you need to know about the word
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English
Noun
yolk sac (plural yolk sacs)
- (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.