histoincompatibility

noun

his·​to·​in·​com·​pat·​i·​bil·​i·​ty ˈhis-(ˌ)tō-ˌin-kəm-ˌpat-ə-ˈbil-ət-ē 

plural histoincompatibilities

: a state of mutual intolerance between tissues (as of a fetus and its mother or a graft and its host) that normally leads to reaction against or rejection of one by the other

histoincompatible

-kəm-ˌpat-ə-bəl 

adjective