dipygus

dipygus

 [di-pi´gus] a malformed fetus with a double pelvis.

di·py·gus

(dī-pī'gŭs, dip'ē-gŭs), Conjoined twins with a single head and thorax and the pelvis and lower extremities duplicated; when the duplications of the lower parts are symmetric, usually called duplicitas posterior. See: conjoined twins. [G. di-, two, + pyge, buttocks]