having two germ layers, the ectoderm and endoderm, as the embryos of sponges and coelenterates.

1880–85; diplo- + -blast + -ic

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World English Dictionary
diploblastic (ˌdɪpləʊˈblæstɪk)
Compare triploblastic (of jellyfish, corals, and other coelenterates) having a body developed from only two germ layers (ectoderm and endoderm)

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American Heritage
Medical Dictionary

diploblastic dip·lo·blas·tic (dĭp'lō-blās'tĭk)
Derived from two embryonic germ layers, the ectoderm and the endoderm. Used of invertebrates such as sponges and coelenterates.

The American Heritage® Stedman's Medical Dictionary
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Example sentences for diploblastic
Coeloms are absent in diploblastic animals such as cnidarians.
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