/ Dictionary / Index T triploblastic: Meaning and Definition of Find definitions for: trip•lo•blas•tic Pronunciation: (trip"lō-blas'tik), [key] — adj. Zool. having three primary germ layers, as the embryos of vertebrates. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. triplite triploid Related Content Daily Word Quiz: blithesome Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language