germinal disk Hear it!

germinal disk definition

germinal disk

  1. a disklike spot in a fertilized ovum in which the first traces of the embryo are visible
  2. the disklike spot on the yolk of a heavily yolked egg where segmentation begins after fertilization

Webster's New World College Dictionary Copyright © 2005 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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