pygodidymus

pygodidymus

 [pi″go-did´ĭ-mus] conjoined twins fused in the cephalothoracic region, with double hips and pelvis.

py·go·did·y·mus

(pī'gō-did'i-mŭs), Conjoined twins with a single cephalothoracic region but with the buttocks and parts below doubled. See: conjoined twins.
See also: duplicitas posterior. [pygo- + G. didymos, twin]