monocephalus

monocephalus

 [mon″o-sef´ah-lus] a malformed fetus with two bodies and one head.

syn·ceph·a·lus

(sin-sef'ă-lŭs), Conjoined twins having a single head with two bodies. See: conjoined twins. Compare: craniopagus, janiceps. Synonym(s): monocephalus, monocranius [syn- + G. kephalē, head]