We found 2 definitions of costia from 2 different sources.
NounPlural: costias |
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costia - a flagellate that is the cause of the frequently fatal fish disease costiasis | ||
Costia necatrix | ||
flagellate, flagellate protozoan, flagellated protozoan, mastigophoran, mastigophore a usually nonphotosynthetic free-living protozoan with whiplike appendages; some are pathogens of humans and other animals |