the cavity containing the major viscera; in mammals it is separated from the thorax by the diaphragm
"During his routine physical, the doctor pressed gently on my abdomen to check for any tenderness beneath the diaphragm."
The fat surrounding the belly.
"After his vacation, he realized that most of the weight he had gained was just extra fat settling around his abdomen."
The word "abdomen" comes from the Latin abdō, meaning "to conceal," which is formed from ab ("away") and -dō ("to put"). It entered English in 1541 via Middle French.