| Noun | 1. | family Babesiidae - piroplasms and cattle pathogens protoctist family - any of the families of Protoctista Haemosporidia, order Haemosporidia - an order in the subclass Telosporidia genus Babesia, genus Piroplasma - type genus of the family Babesiidae piroplasm - minute parasite of red blood cells of mammals transmitted by a tick and causing diseases of domestic animals |