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Having body tissues derived from three germ layers, the endoderm, mesoderm, and ectoderm, seen in all multicellular animals except certain invertebrates such as the cnidarians and sponges.
(Zoology) (of all multicellular animals except coelenterates) having a body developed from all three germ layers. Compare diploblastic
[C19: from triplo- threefold (from Greek triploos) + -blast]
trip•lo•blas•tic(ˌtrɪp loʊˈblæs tɪk)
(of an embryo) differentiating into three primary layers, the ectoderm, endoderm, and mesoderm.
[1885–90; < Greek tripló(os) threefold + blastikós budding]