coc·cid·i·um | \ käk-ˈsi-dē-əm 
\
\ plural coccidia\ käk-ˈsi-dē-ə \
\Definition of coccidium
: any of an order (Coccidia) of protozoans usually parasitic in the digestive epithelium of vertebrates
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Time Traveler for coccidium
The first known use of coccidium was circa 1879
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