pygoamorphus

pygoamorphus

 [pi″go-ah-mor´fus]
asymmetrical conjoined twins, in which the parasite is an amorphous mass attached to the sacral region of the autosite.

py·go·a·mor·phus

(pī'gō-ă-mōr'fŭs),
Conjoined twins in which the parasite, attached to the buttocks of the autosite, is reduced to a formless mass or embryoma. See: conjoined twins.
[pygo- + G. a- priv. + morphē, form]