/ Dictionary / Index N nucleoprotein: Meaning and Definition of Find definitions for: nu•cle•o•pro•tein Pronunciation: (n"klē-u-prō'tēn, -tē-in, ny"-), [key] — n. Biochem. any of the class of conjugated proteins occurring in cells and consisting of a protein combined with a nucleic acid, essential for cell division and reproduction. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: nucleoprotein (Thesaurus) nucleoplasm nucleosidase 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