Definition of 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. 2
The word "gastraea" uses 8 letters: A A A E G R S T.
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Words formed by adding one letter before or after gastraea (in bold), or to aaaegrst in any order:
s - gastraeas
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