Germinal-disk meaning

(biology) A small circular white spot on the surface of the yolk of an egg.
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A flattened, disklike region of cells from which the embryo begins to develop in the fertilized ovum of many vertebrate species.
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A disklike spot in a fertilized ovum in which the first traces of the embryo are visible.
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The disklike spot on the yolk of a heavily yolked egg where segmentation begins after fertilization.
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