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Definition of parasite noun from the Oxford Advanced American Dictionary

     

    parasite

     noun
    noun
    NAmE//ˈpærəˌsaɪt//
     
     
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  1. 1 a small animal or plant that lives on or inside another animal or plant and gets its food from it fleas, lice, and other parasites an intestinal parasite of cattle
  2. 2(disapproving) a person who always relies on or benefits from other people and gives nothing back He regards students as parasites on society.
See the Oxford Advanced Learner's Dictionary entry: parasite