gastrula
English Thesaurus
1. 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 (noun.animal)
| hypernym | : | conceptus, embryo, fertilized egg, |
| definition | : | an animal organism in the early stages of growth and differentiation that in higher forms merge into fetal stages but in lower forms terminate in commencement of larval life (noun.animal) |
| part holonym | : | archenteron, |
| definition | : | central cavity of the gastrula; becomes the intestinal or digestive cavity (noun.animal) |
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