Midriff

Midriff is a particular term to denominate the section of the human body between the thorax/chest and the pelvis/hips. It is used (1) as a genteel avoidance of synonymous belly (with its primary external physical feature, the navel); (2) as a synonym for waist; and (3) as a name for the area around (yet mainly below) the diaphragm (particularly including the stomach region).