/ Dictionary / Index T trinucleotide: Meaning and Definition of Find definitions for: tri•nu•cle•o•tide Pronunciation: (trī-n'klē-u-tīd", -ny'-), [key] — n. Genetics. three linked nucleotides; triplet. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. trinomial trio Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language