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Definition of Blastodisk
1. Noun. (biology) A round, flattened region of cells from which the embryo of many vertebrates begins to develop in the fertilized ovum; a germinal disk ¹
¹ Source: wiktionary.com
Medical Definition of Blastodisk
1. 1. The disk of active cytoplasm at the animal pole of a telolecithal egg. 2. The blastoderm, especially in very young stages when its extent is small. (05 Mar 2000)