/ Dictionary / Index T tumor: Meaning and Definition of Find definitions for: tu•mor Pronunciation: (t'mur, ty'-), [key] — n. a swollen part; swelling; protuberance. an uncontrolled, abnormal, circumscribed growth of cells in any animal or plant tissue; neoplasm. inflated pride; haughtiness. pompous language; bombast. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: tumor (Thesaurus) tummy tuck tumorigenesis Related Content Daily Word Quiz: profiterole Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language