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Medical Definition of Peritrichida
1. An order of ciliates (subclass Peritrichia, phylum Ciliophora) characterised by a cylindrical shape with the cilia usually limited to the zone surrounding the mouth opening; includes the suborder Mobilina, whose members are all ecto-or endoparasites of aquatic invertebrates and vertebrates, of which the genus Trichodina includes economically important gill parasites of fish. Origin: peri-+ G. Thrix, hair (05 Mar 2000)
Lexicographical Neighbors of Peritrichida
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