antiperiodic
  抗瘧藥; 反週期
  an·ti·pe·ri·od·ic /ˌæntɪˌpɪrɪˈɑdɪk, ˌænˌtaɪ-/ 形容詞
  抗瘧劑
  An·ti·pe·ri·od·ic n. Med. A remedy possessing the property of preventing the return of periodic paroxysms, or exacerbations, of disease, as in intermittent fevers.
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