coccidia

Concise Oxford English Dictionary © 2008 Oxford University Press:
coccidia /kɒkˈsɪdɪə/

▶plural noun Biology parasitic protozoans of a group responsible for toxoplasmosis and other diseases. [Suborder Eimeriorina.]

– derivatives
coccidian adjective & noun,
coccidiosis noun.

– origin C19: from mod. L. (former order name), from Gk kokkis, dimin. of kokkos ‘berry’.