deradelphus

deradelphus

 [der″ah-del´fus] malformed twins fused at or near the navel and having one head.

der·a·del·phus

(dār'ă-del'fŭs), Conjoined twins with a single head and neck and separate bodies below the thoracic level.
See also: conjoined twins.
[G. derē, neck, + adelphos, brother]

deradelphus

(dĕr-ă-dĕl′fŭs) [Gr. dere, neck, + adelphos, brother] A pair of malformed twins, fused above the thorax and having one head, but separated below the chest as two bodies.