| janiceps | Conjoined twins having their two heads fused together, with the faces looking in opposite directions. See: conjoined twins. See: craniopagus, syncephalus. Origin: L. Janus, a Roman diety having two faces, + caput, head (05 Mar 2000) |
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| janiceps asymmetrus | A janiceps with one very small and imperfectly developed face. Synonym: iniops, syncephalus asymmetros. (05 Mar 2000) |
| janiceps parasiticus | A janiceps in which one of the twins is a small and incompletely formed parasite attached to the more fully formed autosite. (05 Mar 2000) |