/ Dictionary / Index P polynucleotide: Meaning and Definition of Find definitions for: pol•y•nu•cle•o•tide Pronunciation: (pol"ē-n'klē-u-tīd", -ny'-), [key] — n. Biochem. a sequence of nucleotides, as in DNA or RNA, bound into a chain. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. polynuclear polynya Related Content Daily Word Quiz: opulent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language