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(Science: anatomy) See diaphragm. Smote him into the midriff with a stone. (milton)

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