[di-sef´ah-lus] a malformed fetus with two heads; called also bicephalus and derodidymus.
di·ceph·a·lus di·'auch·e·nos
a dicephalus with separate necks. Synonym(s): derodidymus
derodidymus
(der?o-did'i-mus) [Gr. dere, neck, + didymos, double] A malformed fetus with two necks and heads but a single body and normal limbs. Synonym: dicephalus