Dictionary![]() ![]() pre•ven•tivePronunciation: (pri-ven'tiv), [key] —adj. 1. Med.of or noting a drug, vaccine, etc., for preventing disease; prophylactic. 2. serving to prevent or hinder: preventive measures. —n. 1. Med.a drug or other substance for preventing disease. 2. a preventive agent or measure. Also,pre•vent•a•tivePronunciation: (pri-ven'tu-tiv) [key] (for defs. 2, 4). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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