/ Dictionary / Index P preventive medicine: Meaning and Definition of Find definitions for: preven'tive med'icine Pronunciation: [key] the branch of medical science that deals with prevention of disease. a medication or other agent used for prophylaxis. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. preventive law preventive war Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language