Gas*trae"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 Gastraea theory of Haeckel. See Gastrula.

 

© Webster 1913.

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