from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Embryology The portion of an egg that is opposite the animal pole and that contains most of the yolk.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The hemisphere of the blastula opposite to the animal pole comprising of large yolk cells dividing at a slower rate that eventually differentiate into the extraembryonic membranes.


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