/ Dictionary / Index P polycistronic: Meaning and Definition of Find definitions for: pol•y•cis•tron•ic Pronunciation: (pol"ē-si-stron'ik), [key] — adj. Genetics. of or pertaining to the transcription of two or more adjacent cistrons into a single messenger RNA molecule. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. polychromy polyclad Related Content Daily Word Quiz: cygnet Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language