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Definition of: gastrula
(gas′tr·lə) noun plural ·lae (-lē) Biol.
That embryonic form of metazoic animals which consists of a two-layered sac enclosing a central cavity or archenteron and having an opening or blastopore at one end. [<NL, dim. of Gk. gastēr stomach]
—gas′tru·lar adjective
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