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(1) A condition of a blastula in which there are three primary germ layers: ectoderm, mesoderm and endoderm.

(2) A condition of an ovum in which it divides forming a blastoderm made up of three layers.


All higher and intermediate animals (i.e. from flat worms to humans develop from a triploblastic embryo.

Word origin: Greek tripló(os), threefold + blastikós, budding.

Related forms: triploblastic (adjective).

Compare: diploblasty.
See also: blastula, germ layer.