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parasite (par´ә-sīt)   a plant or animal that lives upon or within another living organism at whose expense it obtains some advantage; see also symbiosis. Parasites include multicelled and single-celled animals, fungi, and bacteria, and some authorities also include viruses. Those that feed upon human hosts can cause diseases ranging from the mildly annoying to the severe or even fatal. adj., parasit´ic., adj.
  parasitic fetus.




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