- the blastula that forms as a flattened sphere on top of the yolk in the yolk-laden eggs of birds and reptiles.
Origin of blastodisk
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- The disk of active cytoplasm at the animal pole of a telolecithal egg.
- 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.