/ Dictionary / Index P polynuclear: Meaning and Definition of Find definitions for: pol•y•nu•cle•ar Pronunciation: (pol"ē-n'klē-ur, -ny'- or, by metathesis, -kyu-lur), [key] — adj. having many nuclei. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. polynomial ring polynucleotide 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