Breadcrumb Home > Dictionary > Index T tumor necrosis factor: Meaning and Definition of Find definitions for: tu'mor necro"sis fac"tor Pronunciation: [key] a protein, produced in humans and other animals, that is destructive to cells showing abnormally rapid growth: identical with cachectin. Abbr.: TNF Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. tumorigenic tump TrendingHere are the facts and trivia that people are buzzing about. Animal Group Terminology Largest Countries in the World (by Area) Current Events This Week: January 2023 State Abbreviations Dinosaur Fossils (By U.S. State!) The Chinese Zodiac ✖ Related Content Daily Word Quiz: catalpa Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language