- Unequal conjoined twins in which the smaller parasite is attached to the larger autosite in the epigastric region. See conjoined twins, under twin.
* * *epi·gas·tri·us -trē-əs n a twin teratological fetus in which one member of the pair is underdeveloped and attached to the epigastric region of the other
* * *epi·gas·tri·us (ep″ĭ-gasґtre-əs) [epi- + gaster] asymmetrical conjoined twins in which the parasitic twin forms a tumor on the epigastrium of the larger twin.
Medical dictionary. 2011.