Definitions
from The Century Dictionary.
- noun An aggregation of formative protoplasm at one pole of the fertilized ovum.
 
from the GNU version of the Collaborative International Dictionary of English.
- noun 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 Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun   Alternative form of 
blastodisk . 
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun a layer of cells on the inside of the blastula
 
Etymologies
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Examples
- 
								
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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