/ Dictionary / Index N nucleo-: Meaning and Definition of Find definitions for: nucleo- Pronunciation: [key] a combining form representingorin compound words: nucleoprotein. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. nucleic acid nucleocapsid Related Content Daily Word Quiz: portent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language