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The Collaborative International Dictionary of English v.0.48:

Delamination \De*lam`i*na"tion\, n. (Biol.) Formation and separation of lamin[ae] or layers; one of the methods by which the various blastodermic layers of the ovum are differentiated. [1913 Webster] Note: This process consists of a concentric splitting of the cells of the blastosphere into an outer layer (epiblast) and an inner layer (hypoblast). By the perforation of the resultant two-walled vesicle, a gastrula results similar to that formed by the process of invagination. [1913 Webster]