pro·phy·lac·tic /ˌprofəˈlæktɪk ||ˌprɑ-/
  (a.)預防疾病的預防藥,預防法,避孕藥
  pro·phy·lac·tic /ˌprofəˈlæktɪk , ˌprɑfə-/ 形容詞
  Proph·y·lac·tic n.  Med. A medicine which preserves or defends against disease; a preventive.
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  Proph·y·lac·tic Proph·y·lac·tic·al, a.  Med. Defending or preserving from disease; preventive.
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  prophylactic
       adj 1: capable of preventing conception or impregnation;
              "contraceptive devices and medications" [syn: contraceptive,
               antifertility]
       2: tending to ward off; "the swastika...a very ancient
          prophylactic symbol occurring among all peoples"- Victor
          Schultze [syn: cautionary, preventive]
       3: preventing or contributing to the prevention of disease;
          "preventive medicine"; "vaccines are prophylactic"; "a
          prophylactic drug" [syn: preventive, preventative]
       n 1: remedy that prevents or slows the course of an illness or
            disease; "the doctor recommended several preventatives"
            [syn: preventive, preventative]
       2: contraceptive device consisting of a thin rubber or latex
          sheath worn over the penis during intercourse [syn: condom,
           rubber, safety, safe]