/ Dictionary / Index N nucleolus: Meaning and Definition of Find definitions for: nu•cle•o•lus Pronunciation: (n-klē'u-lus, ny-), [key] — pl. -li a conspicuous, rounded body within the nucleus of a cell. See diag. under Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: nucleolus (Thesaurus) nucleolated nucleon 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