germinal disk

American  

noun

Embryology.

1. blastodisk.

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Etymology

Origin of germinal disk

First recorded in 1875–80

Example Sentences

First is formed a lens-shaped circular germinal disk.

From The Evolution of Man — Volume 1 by Haeckel, Ernst Heinrich Philipp August

These "eating yelk-cells" are found in large numbers in the food-yelk of the Selachii, especially in the yelk-wall—the border zone of the germinal disk in which the embryonic vascular net is first developed.

From The Evolution of Man — Volume 2 by Haeckel, Ernst Heinrich Philipp August

Oval germinal disk of the rabbit, magnified about ten times.

From The Evolution of Man — Volume 1 by Haeckel, Ernst Heinrich Philipp August

The tread, which thus becomes the germinal disk, now has the appearance of an eight-rayed star.

From The Evolution of Man — Volume 1 by Haeckel, Ernst Heinrich Philipp August

Segmentation is, as in other richly yolked eggs, incomplete, confined to the germinal disk at the opercular pole.

From Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 8 "Cube" to "Daguerre, Louis" by Various