definition of
midriff

[1] #1 midriff n. [middle, midsection] the middle area of the human torso (usually in front); "young American women believe that a bare midriff is fashionable". wn

[2] #2 midriff n. [diaphragm] (anatomy) a muscular partition separating the abdominal and thoracic cavities; functions in respiration. wn