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Having body tissues derived from only two germ layers, the endoderm and the ectoderm, as in the cnidarians.
(Biology) (of jellyfish, corals, and other coelenterates) having a body developed from only two germ layers (ectoderm and endoderm). Compare triploblastic
dip•lo•blas•tic(ˌdɪp ləˈblæs tɪk)
having two embryological germ layers, the ectoderm and endoderm, as in cnidarians.