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Definition of: germinal disk

Biol.
1. A disklike area of the blastoderm of eggs of amniotic vertebrates, in which the embryo proper first appears.
2. In meroblastic eggs with much yolk, the disklike protoplasmic part, which undergoes segmentation. Also called blastodisk. Compare illustration under EMBRYOLOGY.

Phrases starting with the letter: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

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