adjective Zoology.
having three primary germ layers, as the embryos of vertebrates.

1885–90; < Greek tripló(os) threefold + blastikós budding. See tri-, -fold, -blast, -ic Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
triploblastic (ˌtrɪpləʊˈblæstɪk)
Compare diploblastic (of all multicellular animals except coelenterates) having a body developed from all three germ layers
[C19: from triplo- threefold (from Greek triploos) + -blast]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Triploblastic relationships were examined in the light of molecular and morphological evidence.
Flatworms are the simplest triploblastic animals with organs.
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