3 definitions found From The Collaborative International Dictionary of English v.0.48 [gcide]: Gastrula \Gas"tru*la\, n.; pl. {Gastrul[ae]}[NL., dim. fr. Gr. ? the stomach.] (Biol.) An embryonic form having its origin in the invagination or pushing in of the wall of the planula or blastula (the blastosphere) on one side, thus giving rise to a double-walled sac, with one opening or mouth (the blastopore) which leads into the cavity (the archenteron) lined by the inner wall (the hypoblast). See Illust. under {Invagination}. In a more general sense, an ideal stage in embryonic development. See {Gastr[ae]a}. -- a. Of or pertaining to a gastrula. [1913 Webster] From WordNet (r) 2.0 [wn]: gastrula n : double-walled stage of the embryo resulting from invagination of the blastula; the outer layer of cells is the ectoderm and the inner layer differentiates into the mesoderm and endoderm [also: {gastrulae} (pl)] From WordNet (r) 2.0 [wn]: gastrulae See {gastrula}
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