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Meaning Of Gastrula
n.
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.