/ Dictionary / Index C carcinogen: Meaning and Definition of Find definitions for: car•cin•o•gen Pronunciation: (kär-sin'u-jun, -jen", kär'su-nu-jen", -nō-), [key] — n. Pathol. any substance or agent that tends to produce a cancer. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: carcinogen (Thesaurus) carcino- carcinogenesis Related Content Daily Word Quiz: blithesome Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language