Definition of triploblastic in English:



  • Having a body derived from three embryonic cell layers (ectoderm, mesoderm, and endoderm), as in all multicellular animals except sponges and coelenterates.

    • ‘The transition from diploblastic to triploblastic body plans hinges on the origin of mesoderm.’
    • ‘Compartmentalization is also the underlying advantage epithelia provide in triploblastic descendants of a diploblastic ancestor.’
    • ‘All bilaterians are triploblastic, which means they develop three germ layers during embryonic development.’
    • ‘The simplest animals that are bilaterally symmetrical and triploblastic (composed of three fundamental cell layers) are the Platyhelminthes, the flatworms.’
    • ‘Common larval types are used to deduce a radially symmetrical, medusa-like organism as the common ancestor for all animal groups above coelenterates, i.e., for all triploblastic animals.’


Late 19th century: from Greek triploos ‘threefold’ + -blast + -ic.