/ Dictionary / Index N neoplasm: Meaning and Definition of Find definitions for: ne•o•plasm Pronunciation: (nē'u-plaz"um), [key] — n. Pathol. a new, often uncontrolled growth of abnormal tissue; tumor. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: neoplasm (Thesaurus) neoplasia neoplasticism Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language