ap·i·com·plex·an 
(ăp′ĭ-kəm-plĕksən)
(ăp′ĭ-kəm-plĕksən)n.
Any of a phylum (Apicomplexa) of protozoans that have a group of organelles and other structures located in the apical end of the cell. Apicomplexans are parasitic in animals and include the organisms that cause malaria and toxoplasmosis.
[From New Latin Apicomplexa, phylum name (after the apical complex of organelles found in the organisms).]