Main Entry: in·com·pat·i·ble

Pronunciation: \ˌin-kəm-ˈpat-ə-bəl\

Function: adjective

1 : unsuitable for use together because of chemical interaction or antagonistic physiological effects <incompatible drugs>
2 of blood or serum : unsuitable for use in a particular transfusion because of the presence of agglutinins that act against the recipient's red blood cells