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[par-uh-si-toid, -sahy-] /ˈpær ə sɪˌtɔɪd, -saɪ-/

an organism that practices .
of or relating to a parasite, especially one practicing .
(zoology) an animal, esp an insect, that is parasitic during the larval stage of its life cycle but becomes free-living when adult
(pār’ə-sĭ-toid’, -sī’toid)
Any of various insects, such as the ichneumon fly, whose larvae are parasites that eventually kill their hosts. The adult parasitoid deposits an egg on or inside the body of its host, typically the larva of another arthropod. When the egg hatches, the parasitoid larva feeds on the host’s tissues, gradually killing it.


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  • Parasitoidism

    [par-uh-si-toi-diz-uh m, -sahy-] /ˈpær ə sɪ tɔɪˌdɪz əm, -saɪ-/ noun 1. the feeding by certain insect larvae on host tissues such that the host remains alive until larval development is complete and then usually dies.

  • Parasitology

    [par-uh-sahy-tol-uh-jee, -si-] /ˌpær ə saɪˈtɒl ə dʒi, -sɪ-/ noun 1. the branch of biology dealing with and the effects of parasitism. /ˌpærəsaɪˈtɒlədʒɪ/ noun 1. the branch of biology that is concerned with the study of parasites parasitology par·a·si·tol·o·gy (pār’ə-sĭ-tŏl’ə-jē, -sī-) n. The study of parasites and parasitism. par’a·si’to·log’ic (-sī’tə-lŏj’ĭk) or par’a·si’to·log’i·cal (-ĭ-kəl) adj.

  • Parasitophobia

    noun a fear of parasites

  • Parasitosis

    [par-uh-sahy-toh-sis, -si-] /ˌpær ə saɪˈtoʊ sɪs, -sɪ-/ noun, Pathology. 1. (def 3). parasitosis par·a·si·to·sis (pār’ə-sĭ-tō’sĭs, -sī-) n. pl. par·a·si·to·ses (-sēz) Infestation with parasites.

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