from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Alternative form of blastodisk.

from the GNU version of the Collaborative International Dictionary of English

  • n. a disc-shaped layer of cells on the surface of the yolk mass of an egg (such as that of a bird) which develops to form the embryo.

from The Century Dictionary and Cyclopedia

  • n. An aggregation of formative protoplasm at one pole of the fertilized ovum.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a layer of cells on the inside of the blastula


Sorry, no etymologies found.


  • If the egg is not fertile the white mark will not be perfectly round and may be smaller (called a blastodisc).



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