Definitions of costia
  1. noun
    a flagellate that is the cause of the frequently fatal fish disease costiasis
    synonyms: Costia necatrix
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    type of:
    flagellate, flagellate protozoan, flagellated protozoan, mastigophoran, mastigophore
    a usually nonphotosynthetic free-living protozoan with whiplike appendages; some are pathogens of humans and other animals
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