- deradelphus
- Conjoined twins with a single head and neck and separate bodies below the thoracic level. See conjoined twins, under twin. [G. dere, neck, + adelphos, brother]
* * *
der·a·del·phus (der″ə-delґfəs) [der- + -adelphus] conjoined twins fused at or near the umbilicus and having only one head.
Medical dictionary. 2011.