n. (Biol.) Formation and separation of laminæ or layers; one of the methods by which the various blastodermic layers of the ovum are differentiated. [ 1913 Webster ]
☞ 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 ]
pos>n. (Chem.) A nitrogenous strongly basic chemical substance (
n. A thermosetting plastic formed by the reaction of melamine and formaldehyde. It is used for molding and for preparing laminated sheets used to surface counter tops, walls, and furniture. The commercially marketed