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|Noun||1.||costia - a flagellate that is the cause of the frequently fatal fish disease costiasis|
flagellate, flagellate protozoan, flagellated protozoan, mastigophoran, mastigophore - a usually nonphotosynthetic free-living protozoan with whiplike appendages; some are pathogens of humans and other animals
genus Costia - a genus of flagellate protoctist