/ Dictionary / Index N nucleophilic: Meaning and Definition of Find definitions for: nu•cle•o•phil•ic Pronunciation: (n"klē-u-fil'ik, ny"-), [key] — adj. Chem. of or pertaining to electron contribution in covalent bonding (opposed to electrophilic). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. nucleonics nucleoplasm Related Content Daily Word Quiz: crutiny Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language