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Adjective: parasitical  ,per-u'si-ti-kul [N. Amer], ,pa-ru'si-ti-kul [Brit]
  1. Of plants or persons; having the nature or habits of a parasite or leech; living off another
    - parasitic, leechlike, bloodsucking
  2. Relating to or caused by parasites
    "parasitical infection";
    - parasitic

See also: dependent