derodidymus

dicephalus

 [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

derodidymus

a monster with two heads; dicephalus.