gastraea noun. [ga'streɪǝ] Also *gastrea. L19.
[mod. Latin, from Greek gastēr, gaster- stomach + Latin -aeus, Greek -aios adjectival suffix.]
Zoology. A hypothetical ancestral form of metazoan (multicellular animal) having two layers of cells, corresponding in organization to the gastrula in the embryonic development of living metazoans.

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