his·to·com·pat·i·bil·i·ty 
(hĭs′tō-kəm-păt′ə-bĭlĭ-tē)
(hĭs′tō-kəm-păt′ə-bĭlĭ-tē)n. pl. his·to·com·pat·i·bil·i·ties
A state or condition in which the absence of immunologic interference permits the grafting of tissue or the transfusion of blood without rejection.
his′to·com·pati·ble adj.