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1. (n.) gastrula
an embryo in an early stage of development during which the blastula differentiates into two cell layers and the central cavity becomes the archenteron.
Etymology: (1875–80)
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| Definition of 'gastrula' |
Princeton's WordNet |
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1. (noun) gastrula
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
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| Definition of 'gastrula' |
Webster Dictionary |
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1. (adj) gastrula
of or pertaining to a gastrula
2. (noun) gastrula
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 Gastraea
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| Definition of 'gastrula' |
U.S. National Library of Medicine |
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1. gastrula
The developmental stage that follows BLASTULA. It is characterized by the morphogenetic cell movements including invagination, ingression, and involution. Gastrulation begins with the formation of the PRIMITIVE STREAK, and ends with the formation of three GERM LAYERS, the body plan of the mature organism.
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Definitions of gastrula 
