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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.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(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]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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]
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