cephalodiprosopus

ceph·a·lo·di·pros·o·pus

(sef'ă-lō-dī-pros'ō-pŭs), Asymmetric conjoined twins with the head of the autosite carrying a reduced parasitic head. See: conjoined twins, diprosopus. [cephalo- + G. di-, two, + prosōpon, face]