Webster's Revised Unabridged Dictionary · 1913

Midriff

Midriff (mid"rif) , noun

[Anglo-Saxon midhrif; midd mid, middle + hrif bowels, womb; akin to OFries. midref midriff, rif, ref, belly, Old High German href body, and to Latin corpus body. See Corpse.]

1.
(Anatomy) See Diaphragm, n., 2.
2.
The middle part of the front of the body, from the waist to the chest.
Smote him into the midriff with a stone. — Milton
3.
That part of a garment, especially a dress or bodice, that covers the midriff{2}.