craniodidymus

dicephalus

 [di-sef´ah-lus]
a malformed fetus with two heads; called also bicephalus and derodidymus.

cra·ni·o·did·y·mus

(krā'nē-ō-did'i-mŭs),
Conjoined twins with fused bodies but with two heads. See: conjoined twins.
[cranio- + G. didymos, twin]

craniodidymus

[krā′nē·ōdid′iməs]
Etymology: Gk, kranion + didymos, twin
a two-headed fetus in which the bodies are fused.

craniodidymus

a monster with two heads.