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.

1885–90; blasto- + disk Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Medical Dictionary

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

  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
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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