vegetal pole

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun 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.

• noun embryology 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.