GNU Collaborative International Dictionary of English

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Found one definition

1.       
   coccidium n.; pl.  coccidia (#). (Microbiol.) any sporozoan of the order Coccidia, parasitic on the digestive epithelium of vertebrates and higher invertebrates.  It is the causative agent of coccidiosis, which can be a problem in poultry rearing.
   
   [WordNet 1.5 +PJC]