gastroamorphus

gas·tro·a·mor·phus

(gas'trō-ă-mōr'fŭs),
An included amorphous parasitic twin within the abdomen of the autosite.
[gastro- + G. amorphos, unshapely]

gastroamorphus

A rarely used term for unequal conjoined twins in which an amorphous parasite is attached to the abdominal wall of the host twin.