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Blastule :: Blastule (n.) Same as Blastula.

Gastrula :: 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..

Archiblastula :: Archiblastula (n.) A hollow blastula, supposed to be the primitive form; a c/loblastula..

Blastula :: Blastula (n.) That stage in the development of the ovum in which the outer cells of the morula become more defined and form the blastoderm.

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