mor·bif·ic /mɔrˈbɪfɪk/ 形容詞
  致病的
  Mor·bif·ic Mor·bif·ic·al a.  Causing disease; generating a sickly state; as, a morbific matter.
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  morbific
       adj : able to cause disease; "infective agents"; "pathogenic
             bacteria" [syn: infective, pathogenic]