/ Dictionary / Index P precancerous: Meaning and Definition of Find definitions for: pre•can•cer•ous Pronunciation: (prē-kan'sur-us), [key] — adj. showing pathological changes that may be preliminary to malignancy. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: precancerous (Thesaurus) precancel precarious Related Content Daily Word Quiz: impetuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language