pre•ven•tivePronunciation: (pri-ven'tiv), [key]
of or noting a drug, vaccine, etc., for preventing disease; prophylactic.
serving to prevent or hinder: preventive measures.
a drug or other substance for preventing disease.
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.