embryonic disk

noun

Definition of embryonic disk 

2 : the part of the inner cell mass of a blastocyst from which the embryo of a placental mammal develops

called also embryonic shield

First Known Use of embryonic disk

circa 1938, in the meaning defined at sense 1a

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The first known use of embryonic disk was circa 1938

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embryonic disk

noun
variants: or embryonic disc

Medical Definition of embryonic disk 

2 : the part of the inner cell mass of a blastocyst from which the embryo of a placental mammal develops

called also embryonic shield

More from Merriam-Webster on embryonic disk

Britannica.com: Encyclopedia article about embryonic disk

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