a malformed fetus with two heads; called also bicephalus and derodidymus.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

di·ceph·a·lus di·'auch·e·nos

a dicephalus with separate necks.
Synonym(s): derodidymus
Farlex Partner Medical Dictionary © Farlex 2012


(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
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