/ Dictionary / Index N nucellus: Meaning and Definition of Find definitions for: nu•cel•lus Pronunciation: (n-sel'us, ny-), [key] — pl. -cel•li the central cellular mass of the body of the ovule, containing the embryo sac. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: nucellus (Thesaurus) nubilous NUCFLASH Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language