n 1  cap  :  a genus of sporozoan protozoans (family Theileriidae) that includes a parasite (T. parva) causing east coast fever of cattle  2  pl  -ri*ae  also  -rias  :  any organism of the genus Theileria thei*le*ri*al adj 
 
Thei•ler, Sir Arnold (1867-1936), South African veterinary bacteriologist.
 
 
 
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