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parasitism

noun

  1. the state or condition of being a parasite
  2. the habits of a parasite
  3. in the U.S.S.R., the state of being unemployed
  4. Biol. a symbiotic association of two kinds of organisms in which the parasite is benefited and the host is usually harmed
  5. Med. the condition of being infested with parasites

See parasitism in American Heritage Dictionary 4

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