Gastraea n. : A primeval larval form; a double-walled sac from which, according to the hypothesis of Haeckel, man and all other animals, that in the first stages of their individual evolution pass through a two-layered structural stage, or gastrula form, must have descended. This idea constitutes the Gastraea theory of Haeckel. See Gastrula.

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Defination from the web:
Gastraea in the Online Dictionary. Meaning of Gastraea. Pronunciation of Gastraea. Translations of Gastraea. Gastraea synonyms, Gastraea antonyms. ... This idea constitutes the Gastræa theory of Haeckel. See Gastrula. How to thank TFD for its existence? ...