gastroamorphus

An included amorphous parasitic twin within the abdomen of the autosite. [gastro- + G. amorphos, unshapely]

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gas·tro·amor·phus (gas″tro-a-morґfəs) [gastro- + amorphus] asymmetrical conjoined twins in which the larger one has fetal parts of the smaller one concealed within its abdomen.