germinal disk

American  

noun

Embryology.

1. blastodisk.

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Etymology

Origin of germinal disk

First recorded in 1875–80

Example Sentences

The circular border of the germinal disk which connects the roof and floor of the segmentation-cavity corresponds to the border-zone at the equator of the amphibian ovum.

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

Germinal area or germinal disk of the rabbit, with sole-shaped embryonic shield, magnified about ten times.

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

There is a brisk multiplication of these at the edge of the germinal disk, especially in the neighbourhood of the sickle-shaped primitive mouth.

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

Sometimes it has been called the germinal disk, sometimes the germinal spot, and usually the germinative area.

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