• synonyms


or blas·to·disc

noun Embryology.
  1. the blastula that forms as a flattened sphere on top of the yolk in the yolk-laden eggs of birds and reptiles.
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Origin of blastodisk

First recorded in 1885–90; blasto- + disk
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

blastodisk in Medicine


  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.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.