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n. pl. coc·cid·i·a (-ē-ə)
Any of various parasitic apicomplexan protozoans that cause diseases such as toxoplasmosis in the digestive tract of vertebrates. Also called coccidian.
[New Latin Coccidium, former genus name : coccus + -idium, diminutive suff. (from Greek -idion).]
(Zoology) any parasitic protozoan of the order Coccidia