janiceps

janiceps

 [jan´ĭ-seps] conjoined twins with a single head and faces on the anterior and posterior aspects.

jan·i·ceps

(jan'i-seps), Conjoined twins with their two heads fused together, with the faces looking in opposite directions. See: conjoined twins.
See also: craniopagus, syncephalus. [L. Janus, a Roman diety having two faces, + caput, head]