cephalodiprosopus

Asymmetrical conjoined twins with the head of the autosite carrying a reduced parasitic head. See conjoined twins, under twin, diprosopus. [cephalo- + G. di-, two, + prosopon, face]

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ceph·a·lo·di·pros·o·pus (sef″ə-lo-di-prosґo-pəs) [cephalo- + di- + Gr. prosopus face] a fetus with a partially incomplete head attached to the head proper.