Definition: midriff

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Source: WordNet (r) 1.7 

midriff
     n 1: the middle area of the human torso (usually in front) [syn:
          middle, midsection]
     2: (anatomy) a muscular partition separating the abdominal and
        thoracic cavities; functions in respiration [syn: diaphragm]

Source: Webster's Revised Unabridged Dictionary (1913) 

Midriff \Mid"riff\, n. [AS. midhrif; midd mid, middle + hrif
   bowels, womb; akin to OFries. midref midriff, rif, ref,
   belly, OHG. href body, and to L. corpus body. See Corpse.]
   (Anat.)
   See Diaphragm, n., 2.

         Smote him into the midriff with a stone. --Milton.