/ Dictionary / Index P polymorphonuclear: Meaning and Definition of Find definitions for: pol•y•mor•pho•nu•cle•ar Pronunciation: (pol"ē-môr"fu-n'klē-ur, -ny'- or, by metathesis, -kyu-lur), [key] — adj. Cell Biol. (of a leukocyte) having a lobulate nucleus. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. polymorphism polymorphous Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language