1. middle, midriff, midsection, area, region

usage: the middle area of the human torso (usually in front); "young American women believe that a bare midriff is fashionable"

2. diaphragm, midriff, muscular structure, musculature, muscle system, membrane, tissue layer

usage: (anatomy) a muscular partition separating the abdominal and thoracic cavities; functions in respiration

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See also: midriff (Dictionary)