blastodisk

blastodisk

[blas-tuh-disk]
noun Embryology.
the blastula that forms as a flattened sphere on top of the yolk in the yolk-laden eggs of birds and reptiles.
Also, blastodisc.


Origin:
1885–90; blasto- + disk

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American Heritage
Medical Dictionary

blastodisk blas·to·disk or blas·to·disc (blās'tə-dĭsk')
n.

  1. The disk of active cytoplasm at the animal pole of a telolecithal egg.

  2. The blastoderm, especially in very early stages when its extent is small.

The American Heritage® Stedman's Medical Dictionary
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