or blas·to·disc

[ blas-tuh-disk ]
/ ˈblæs təˌdɪsk /

noun Embryology.

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

Nearby words

  1. blastocyte,
  2. blastocytoma,
  3. blastoderm,
  4. blastodermic vesicle,
  5. blastodisc,
  6. blastoff,
  7. blastogenesis,
  8. blastoma,
  9. blastomere,
  10. blastomycete

Origin of blastodisk

First recorded in 1885–90; blasto- + disk Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Medicine definitions for blastodisk



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.