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Definition of BLASTULA. : an early metazoan embryo typically having the form of a hollow fluid-filled rounded cavity bounded by a single layer of cells â compare gastrula, morula.â blasÂ·tuÂ·laÂ·tion \Ëblas-chÉ-ËlÄ-shÉn\ noun. See blastula defined for kids. ADVERTISEMENT.efinition of BLASTULA. : an early metazoan embryo typically having the form of a hollow fluid-filled rounded cavity bounded by a single layer of cells â compare gastrula, morula.