Yolk sac

noun

Word Frequency: 0.6

Definitions

1.nounA membranous sac attached to an embryo, providing early nourishment in the form of yolk in bony fishes, sharks, reptiles, birds, and primitive mammals.

Synonyms

ink sac postlarva bag of waters skein eleutheroembryo nest ichthidin branchial arch jellycoat symplectic kype oyster

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