noun
midriff
MID-rif/ˈmɪdrɪf/
The front middle part of the body between the chest and waist.
Her short shirt leaves her midriff bare in the sunshine.

Etymology
The “middle-belly” compound originally named the diaphragm. Its later use as a polite alternative to “belly,” especially in fashion, shifted attention to the visible middle of the body.
In context
the abdomen is colloquially called the belly the tummy the midriff or the stomach so it is the abdomen that we are talking about
More examples
- He takes a punch to the midriff during the match.
- This swimsuit covers my midriff.
- The dancers wear costumes that expose their midriffs.
Forms
midriff · midriffs