abdomen
/ˈæbdəmən/
/æbˈdoʊmən/
noun
The part of the body of a vertebrate containing the digestive organs; the belly. In humans and other mammals, it is bounded by the diaphragm and the pelvis.
It is quite common to develop a vertical, pigmented line on the skin of the abdomen below the belly button, which fades later.
stomach,belly,gut,middle,midriff,intestines