a malformed fetus with a double pelvis.
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]
Etymology: Gk, di, twice, pyge, rump
a malformed fetus that has a double pelvis, one of which is usually not fully developed.
a fetus with a double pelvis.