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gastrula (n.)

1874, a Modern Latin coinage (Haeckel), from Latin gaster, from Greek gaster (genitive gastros) "stomach" (see gastric) + Latin -ula, diminutive suffix. Related: Gastrular; gastrulation.

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Definitions of gastrula

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;
From wordnet.princeton.edu