/ Dictionary / Index I intron: Meaning and Definition of Find definitions for: in•tron Pronunciation: (in'tron), [key] — n. Genetics. a noncoding segment in a length of DNA that interrupts a gene-coding sequence or nontranslated sequence, the corresponding segment being removed from the RNA copy before transcription. Also calledCf. exon. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: intron (Thesaurus) intromit Intropin Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language