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Answer for the clue "Double-walled stage of the embryo succeeding the blastula ", 8 letters:
gastrula

Alternative clues for the word gastrula

Word definitions for gastrula in dictionaries

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
1877, Modern Latin, from Greek gaster (genitive gastros ) "stomach" (see gastric ) + Latin -ula , diminutive suffix. Related: Gastrulation .

WordNet Word definitions in WordNet
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 [also: gastrulae (pl)]

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Planula \Plan"u*la\, n.; pl. Planul[ae] . [L., a little plane.] (Biol.) In embryonic development, a vesicle filled with fluid, formed from the morula by the divergence of its cells in such a manner as to give rise to a central space, around which the cells ...

Wiktionary Word definitions in Wiktionary
n. (context embryology English) A stage in the development of embryos of most animals consisting of a two-layered sac of ectoderm and endoderm.