/ Dictionary / Index N nucleocapsid: Meaning and Definition of Find definitions for: nu•cle•o•cap•sid Pronunciation: (n"klē-u-kap'sid, ny"-), [key] — n. Microbiol. the nucleic acid core and surrounding capsid of a virus; the basic viral structure. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. nucleo- nucleoid 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