1 definition found From The Collaborative International Dictionary of English v.0.48 [gcide]: Gastraea \Gas*tr[ae]"a\, n. [NL., from Gr. ?, ?, the stomach.] (Biol.) 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 Gastr[ae]a theory of Haeckel. See {Gastrula}. [1913 Webster]
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