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Definition of: blastula
(blas′ch
·lə) noun plural ·lae (-lē) Biol.
The stage of the embryo just preceding the formation of the gastrula; a hollow sphere of one layer of blastomeres enclosing a blastocele or segmentation cavity. [<NL <Gk. blastos sprout]
—blas′tu·lar adjective
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