pre·ven·tive /-ˈvɛntɪv/
 (a.)預防的,做預防的,妨礙的防止物,預防方法,預防藥
 preventive
 預防
 Pre·vent·ive a.
 1. Going before; preceding. [Obs.]
    Any previous counsel or preventive understanding.   --Cudworth.
 2. Tending to defeat or hinder; obviating; preventing the access of; as, a medicine preventive of disease.
    Physic is either curative or preventive.   --Sir T. Browne.
 Preventive service, the duty performed by the armed police in guarding the coast against smuggling. [Eng]
 Pre·vent·ive, n. That which prevents, hinders, or obstructs; that which intercepts access; in medicine, something to prevent disease; a prophylactic.
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 preventive
      adj 1: preventing or contributing to the prevention of disease;
             "preventive medicine"; "vaccines are prophylactic"; "a
             prophylactic drug" [syn: preventative, prophylactic]
      2: tending to prevent or hinder [syn: preventative] [ant: permissive]
      3: tending to ward off; "the swastika...a very ancient
         prophylactic symbol occurring among all peoples"- Victor
         Schultze [syn: cautionary, prophylactic]
      n 1: remedy that prevents or slows the course of an illness or
           disease; "the doctor recommended several preventatives"
           [syn: preventative, prophylactic]
      2: any obstruction that impedes or is burdensome [syn: hindrance,
          hitch, preventative, encumbrance, incumbrance, interference]
      3: an agent or device intended to prevent conception [syn: contraceptive,
          preventative, contraceptive device, prophylactic
         device, birth control device]