(of all multicellular animals except coelenterates) having a body developed from all three germ layers
Compare diploblastic
Word origin
C19: from triplo- threefold (from Greek triploos) + -blast
triploblastic in American English
(ˌtrɪploʊˈblæstɪk)
adjective
Zoology
of or pertaining to the metazoan body structure, except that of cnidarians, with three basic cellular layers, the ectoderm, the endoderm, and the mesoderm
Word origin
< Gr triploos, triple < tri-, tri- + IE *-plo- (see double) + blast- + -ic