midriff

• midrif (obsolete)

From Middle English mydryf, from Old English midrif, midhrif (“the midriff; diaphragm”), equivalent to mid- +‎ riff.

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midriff (plural midriffs)

1. The middle section of the human torso, from below the chest to above the waist
   • 1960, P[elham] G[renville] Wodehouse, chapter XXI, in Jeeves in the Offing, London: Herbert Jenkins, OCLC 1227855:

     I stuck it out for about an hour and then, apprised by a hollow feeling in the midriff that the dinner hour was approaching, laid a course for home.

• diaphragm